Rondo off to the races?

A little less than a year after he challenged three-time Olympic gold medalist Usain Bolt -- the world-record holder in the 100 and 200 meters -- to a race, Celtics guard Rajon Rondo appears to have turned his attention to Tennessee Titans running back Chris Johnson.

On Monday, Johnson posted the following to his Twitter account:

My bradda @lambo6 called me and said they point guard rondo want to race me for 2k that's easy money set it up on espn

Lambo6 is the Twitter account name of Celtics reserve Marquis Daniels, who, like Johnson, grew up near Orlando.

Later Monday, Johnson posted a follow-up:

@lambo6 tell rondo I got a blank check

Johnson leads the NFL with 1,396 rushing yards this season and is well-known for his record-setting 40-yard dash time of 4.24 seconds at the NFL combine in 2008. That's the best time ever recorded using electronic timing.

Earlier this season, after a full-court dash in a win over Utah, Rondo suggested -- tongue firmly in cheek -- that he could probably run the 40 in 3.8 seconds (which was the time on the clock when he made the mad end-to-end rush for a basket before the third-quarter buzzer).

But, joking aside, Rondo is certainly no slowpoke. An NBA court is 94 feet long (31.3 yards) and the Celtics have timed Rondo going from end to end -- with a ball -- in 3.1 seconds. That also figures dribbling and running off a midcourt pick.

Rondo's teammates weren't shy about picking him. From his Twitter acccount, Ray Allen posted Tuesday night:

I have Rondo in a race over Chris Johnson of the Titans. Who do you guys have?

While a real race is unlikely to occur, it was noted on our SportsCenter blog that Rondo and the Celtics visit Memphis on Dec. 14, the day after the Titans have a home game in Nashville.