Andy Roddick couldn’t hang on to win his fourth-round match against Juan Martin del Potro on Wednesday, losing in four sets to the 23-year-old who won the tournament in 2009. Roddick, who won the first set in a tie breaker, lost steam as the match went on. The final score was 6–7 (7–1), 7–6 (7–4), 6–2, 6–4. The 30-year-old Nebraska native had announced that he would retire at the end of this tournament because of injuries. After his forehand flew wide on the last point, Roddick embraced del Potro and took in the applause from the crowd.