Juan Martin del Potro overcame delays from the rain and his opponent to pull out a grueling four-set win over Guillermo Garcia-Lopez on Wednesday in the first round of the U.S. Open.
The 2009 champion was frustrated by the 74th-ranked Spaniard's repeated calls for a trainer to work on his left leg. Del Potro, seeded sixth, came from a set down to win 6-3, 6-7 (5), 6-4, 7-6 (7) in 4 hours, 13 minutes.
The Spaniard saved three match points in the final tiebreaker before del Potro put him away with an emphatic backhand winner.
Garcia-Lopez last year upset 10th-seeded Juan Monaco in a fifth-set tiebreaker in the first round at Flushing Meadows last year.