okay, now this is quite possibly one of my favorite covers jon has done. 
I've done my best to piece this together, its not exactly what jon does, 
because it sounds like he picks out the chords more in the verse and i'm 
pretty sure at least one chord is horribly wrong. well here goes.

(for the chorus hit the root note, then strum)

(Standard tuning)

Intro:

e|---------------------------------------------------------|
B|---------------------------------------------------------|
G|--------5/6----------5/6-------------5/6------------5/6--|
D|--------6/7----------6/7-------------6/7------------6/7--|
A|-----7------------7----------7----7--------------7-------|
E|--5----------0-5---------------5-----------0--5----------|

Verse 1:

   (you can guess the strumming yourself here)
e|-----------------------------------------------------------------------|
B|--5--------------------------------5-----------------------------------|
G|--7-----------------5/6------------7---------------------------5/6-----|
D|--6-----------------6/7------------6---------------------------6/7-----|
A|--7-------------7------------------7-------------------------7---------|
E|-------------5--------------------------------------------5------------|
  Howard, the strangest thing has happened, lately when I,

e|------------------------------------------4-------------------------|
B|------------------------------------------5-------------------------|
G|--9---------------------6-----------------6-------------------------|
D|--9---------------------7-----------------6-------------------------|
A|--7---------------------7-----------------4-------------------------|
E|------------------------5-----------------4-------------------------|
  Take a good swing. and all of my dreams, they pivot and slip

e|--4---------------------------------------------------|
B|--4---------------------------------------------5-----|
G|--4---------------------------------------------7-----|
D|--6------------9--------------------------------6-----|
A|--6------------9--------------------------------7-----|
E|--4------------7--------------------------------------|
     I drop my fists and they're back laughing...Howard

Verse 2:

e|-------------------------------------------------------------|
B|-------------------5-----------------------------------------|
G|--6----------------7------------------------------------5/6--|
D|--7----------------6------------------------------------6/7--|
A|--7----------------7---------------------------------7-------|
E|--5-----------------------------------------------5----------|
   My intention's become not to lose what i've won

e|--------------------------------4-----------|
B|--------------------------------5-----------|
G|--9----------------6------------6-----------|
D|--9----------------7------------6-----------|
A|--7----------------7------------4-----------|
E|-------------------5------------4-----------|
  Ambition is giving way to desperation and I,
                                       (strum then let ring)
e|--4-----------------------------------------|
B|--4---------------------------------5~------|
G|--4---------------------------------7~------|
D|--6------------------9--------------6~------|
A|--6------------------9--------------7~------|
E|--4------------------7----------------------|
       I've lost the fight from my eyes...

Chorus:

e|-------------------------------------------0-------------0----------|
B|-------------------------------------------0-------------2----------|
G|---------------7--------------3----4-------1-------------2-------3--|
D|---7-----------7----------7---2----4-------2-------------2-------2--|
A|---7-----------5----------7---4----2-------2-------------0-------4--|
E|---5----------------------5---2------------0---------------------2--|
   Boxing's been good to me Howard, now I'm told, "you're growin' old"

e|---------------------0-------0---------------------------|
B|---------------------0-------2---------------------------|
G|------4--------------1-------2---------3-------------4---|
D|------4--------------2-------2---------2-------------4---|
A|------2--------------2-------0---------4-------------2---|
E|---------------------0-----------------2-----------------|

   The whole time you knew. a couple of years I'd be through...

e|-----------------------------|
B|-------5~--------------------|
G|-------7~--------------------|
D|-------6~--------------------|
A|-------7~--------------------|
E|-----------------------------|
   Has Boxing been good to you?

Post-Chorus 1:

e|-----------------------------------|
B|-----------------------------------|
G|----------5/6--------------5/6-----|
D|----------6/7--------------6/7-----|
A|-------7---------7------7----------|
E|----5--------------5---------------|

Verse 3:
  (unsure of this)
e|--------------------------------------------------------------------|
B|-------5---0-------------------5------------------------------------|
G|--------7----------5--6--------7-------------------------------5/6--|
D|----6--------------6--7--------6-------------------------------6/7--|
A|----7-----------7--------------7----------------------------7-------|
E|--------------5-------------------------------------------5---------|
    Howard,     I   confess I'm scared, and lonely and tired.

e|---------------------------------------4------------------|
B|---------------------------------------5------------------|
G|---9-----------------------------------6------------------|
D|---9---------------------7-------------6------------------|
A|---7---------------------7-------------4------------------|
E|-------------------------5-------------4------------------|
   They seem to think i'm made of clay, another day

e|--4----------------------------------------------------------|
B|--4-----------------------------------5----------------------|
G|--4-----------------------------------7----------------------|
D|--6---------------------9-------------6----------------------|
A|--6---------------------9-------------7----------------------|
E|--4---------------------7------------------------------------|
     I'm not cut out for this, i just know what to say... I say

Chorus (1x)

Post Chorus 2:

e|-------------------------------------|
B|-------------------------------------|
G|---------5/6------------5/6----------|
D|---------6/7------------6/7----------|
A|------7--------------7---------------|
E|---5------------0-5------------------|

Bridge:

e|-----0----------------------------------------------------0-------------|
B|-----0----------------------------------------------------5-------------|
G|-----5----------------------------------------------------5-------------|
D|-----7----------------------------------------------------x-------------|
A|-----7----------------------------------------------------0-------------|
E|-----0----------------------------------------------------0-------------|
   Oh sometimes i punch myself as hard as I can, yelling "nobody cares"

e|----------------------------------0----------------------------|
B|----------------------------------0----------------------------|
G|----------------------------------5----------------------------|
D|----------------------------------7----------------------------|
A|----------------------------------7----------------------------|
E|----------------------------------0----------------------------|
   Hoping someone will tell me how wrong I am.

e|----0------------------0------------------|
B|----0------------------0------------------|
G|----5------------------1------------------|
D|----7------------------2------------------|
A|----7------------------2------------------|
E|----0------------------0------------------|
     Nooooooooo......oooooooo          I say..

Chorus v2:(think 3/4 time)

(palm mute after each note)
e|------------------------------------------------0-0-----------0-0---------|
B|------------------------------------------------0-0-----------2-2---------|
G|--------------------7--7---------3-3----4-4-----1-1-----------2-2----3-3--|
D|-----7----7---------7--7---7-7---2-2----4-4-----2-2-----------2-2----2-2--|
A|-----7----7-----5----------7-7---4-4--2---------2-2---------0--------4-4--|
E|-5------------------------5----2--------------0--------------------2------|
   Boxing's been good to me Ho...ward, now I'm told, "you're growin' old"

        (looser muting here, more like strumming)
e|-----------------------0-0-------0--0-------------------2~------|
B|-----------------------0-0-------2--2-------------------4~------|
G|------------4----4-----1-1-------2--2--------3---3------4~------|
D|------------4----4-----2-2-------2--2--------2---2------4~------|
A|-------2---------------2-2----0--------------4---4------2~------|
E|---------------------0-------------------2--------------2~------|
   The whole time you knew.  a couple of years I'd be through...

e|-------------------------------------------|
B|-------5~--------------------5~------------|
G|-------7~--------------------7~------------|
D|-------6~--------------------6~------------|
A|-------7~--------------------7~------------|
E|-------------------------------------------|
   Has Boxing been good, Has Boxing been good to you?

Outro:

e|-------------------------------------------------|
B|-------------------------------------------------|
G|--------5/6----------5/6-------------5---6~------|
D|--------6/7----------6/7-------------6---7~------|
A|-----7-------7----7----------7---7-------7~------|
E|--5------------5---------------5---------5~------|

END

please rate.
peace and happy playing.