Even before Ryan Harrison broke his racket by spiking it on the Citi Open court or screamed "Oh, my God!" in exasperation, top-seeded Juan Martin del Potro was feeling pretty good about the way things were going Thursday.
Top-seeded John Isner figured he would struggle in his first match Thursday in the Atlanta Open. He had no idea he would barely beat 19-year-old wild-card entry Christian Harrison 7-6 (9), 4-6, 7-5 to avoid an upset and reach the quarterfinals.
Third-seeded Feliciano Lopez of Spain had four of his 13 aces in a tiebreaker to overpower Italy's Paolo Lorenzi 6-4, 7-6 (4) on Wednesday night in the second round of the U.S. Men's Clay Court Championships at River Oaks Country Club.
Top-ranked Novak Djokovic defeated Kevin Anderson 6-2, 6-3 to reach the fourth round of the BNP Paribas Open on Monday, while American men had mixed results, with No. 8 Mardy Fish and Andy Roddick knocked out and John Isner winning.