Spillover from Tuesday's delayed matches will highlight early action at the U.S. Open on Wednesday, as Andy Roddick's critical round-of-16 match with Juan Martin del Potro will highlight action at Arthur Ashe Stadium with the two locked in a first-set tiebreaker.

Roddick, of course, will be looking to extend his career after announcing this U.S. Open will be his last tournament.

An earlier delayed match from Tuesday between No. 11 Marion Bartoli and No. 3 Maria Sharapova will open the morning's action on Arthur Ashe with Sharapova trailing Bartoli 4-0 in the first set in quarterfinal action.

Novak Djokovic's meeting with Stanislas Wawrinka for a spot in the quarterfinals will also highlight the day's action.

Spots in the semifinals will be on the line for the likes of Andy Murray, Serena Williams and Roger Federer on the day as the U.S. Open reaches crunch time.

For a full schedule of the day's matches, visit USOpen.org. For live streaming, check out U.S. Open Live. Coverage will be available all day on ESPN2.

For more on the 2012 U.S. Open, check out SB Nation's tennis hub.