Gulbis, at 21 the youngest player in the 28-man field, was a 7-5, 7-5 winner over 22-year-old Lukas Lacko of Slovakia, and Schuettler, at 34 the oldest player in the event, was leading No. 7 seed Horacio Zeballos, 6-3, 3-0, when the Argentine retired with a left shoulder injury.

They were joined in the second round by No. 6 seed Janko Tipsaveric of Serbia, who downed Colombian Santiago Giraldo, 6-1, 6-0, while Israel's Dudi Sela outlasted Xavier Malisse of Belgium, 6-1, 4-6, 6-3.

Gulbis was playing for the first time since injuring a right hamstring muscle at the French Open on May 23.

“I didn't care how I play, I just wanted to win, whatever the score, whatever the match (quality), ugly tennis or whatever, to get some wins going,” the fifth-seeded Gulbis said.

“The match was really ugly to watch. I didn't hit too many clean shots. I was running and putting the ball back, but the only thing I did well was serving. In cases like this it's win, whatever it takes. You push, you run, you fight, do whatever.” Gulbis, who won his first ATP Tour title at Delray Beach, Florida earlier this year, is a potential opponent for top-seed Andy Murray in the quarterfinals.

Murray, who's No. 4 in the world, is a wild-card replacement for second-ranked Novak Djokovic, who withdrew for personal reasons. The other top singles seeds with first round byes in this event are 2009 champion Sam Querrey of the United States, No. 3 Marcos Baghdatis of Cyprus and No. 4 Feliciano Lopez of Spain.

In doubles, top seeds Bob and Mike Bryan of the United States will be seeking their sixth title here. If successful, they will overtake retired Australian stars Mark Woodforde and Todd Woodbridge for the most championships in the Open era. Both teams have 61.
 

In Stanford, California, red-hot Agnieszka Radwanska beat South Africa's Chanelle Scheepers 7-5, 4-6, 6-3 in the first round of the 700,000 dollar WTA Bank of the West Classic on Monday.

The third seeded Radwanska, of Poland, registered both of her aces in the third set and won both of her break points.

Radwanska has won four of her last five matches after winning four of her previous 10.

She advanced to the semis at Indian Wells and Dubai and the fourth round at Wimbledon, Scheepers, ranked 91st, had a strong outing at the French Open earlier this year, reaching the fourth round as a qualifier. On June 7 she cracked the top 100 in the world for the first time.

A pair of former world No. 1s, Ana Ivanovic of Serbia and Dinara Safina of Russia, had mixed results Monday.

Wild card Ivanovic beat Russian Alisa Kleybanova 6-3, 6-2. Ivanovic is now ranked 63rd in the world.

Safina was eliminated by Japan's Kimiko Date Krumm 4-6, 7-6 (7/0), 6-2 in two hours, 22 minutes. Safina, currently the 35th ranked player, has lost six straight matches.

In other first round matches, Olga Govortsova defeated Alla Kudryavtsena 6-1, 6-1 and Dominika Cibulkova downed American Hilary Barte 6-2, 6-2.
 

In Istanbul,  Anastasija Sevastova of Latvia has defeated second-seeded Petra Kvitova of Czech Republic 6-2, 0-6, 6-4 in the first round of the Istanbul Cup.

Third-seeded Anastasia Pavlyuchenkova of Russia easily advanced to the second round Tuesday by beating Poland’s Marta Domachowska 6-1, 6-0, while No. 5 Tsvetana Pironkova of Bulgaria defeated Tatjana Malek of Germany 7-6 (4), 6-2.