Roddick moved on after an ill Philipp Kohlschreiber of Germany retired in the second set. Kohlschreiber stopped while trailing 6-3, 2-1 after missing an easy overhead, shanking a forehand wide and double-faulting to drop his serve.

Isner fought off five match points in the two tiebreakers to defeat Polish qualifier Lukasz Kubot 4-6, 7-6 (9), 7-6 (7). Isner served 24 aces, but failed to break Kubot.

Next up for the 20th-ranked Isner is Roger Federer, who received a bye in the first round.

Roddick is looking to avoid falling out of the year-end top 10 for the first time in nine seasons. The 11th-ranked Roddick reached the Japan quarterfinals last week, his first tournament since an early exit at the US Open.

“I thought I hit the ball well in what we did play today,” Roddick said. “I started to hit the ball pretty well last week, also. I don’t feel like I’m fighting myself out there. After the Open, I was able to train the way I want to for the first time in a while.”

Roddick will face Guillermo Garcia-Lopez of Spain.

Wimbledon finalist Tomas Berdych of the Czech Republic defeated Tommy Robredo of Spain 6-0, 6-4, despite battling stomach problems  the past two days.

“I felt quite weak so I was trying to play a little more aggressively, play really risky shots just to try to hang in there,” Berdych said. “I was really lucky. I don’t know what could have happened if I lost the second set.”

Chinese wildcard Yan Bai, ranked 465th, upset 30th-ranked Radek Stepanek of the Czech Republic 6-3, 6-4 for his first win on the main tour.

Yan will meet fourth-seeded Andy Murray.

“I have some pressure, of course, because this is my home country,” Yan said. “(Murray) is a very talented player — much better than me. I hope to learn from him in our match.”

David Ferrer rolled past Michael Llodra 7-6 (2), 6-1, while Ivan Ljubicic struggled to beat wildcard Zhang Ze 5-7, 6-3, 6-4.

Janko Tipsarevic stopped Andrey Golubev 6-3, 6-4, and Daniel Gimeno-Traver, a lucky loser who replaced the injured Mardy Fish, rallied past Denis Istomin 3-6, 6-3, 6-3 before rain shortened the schedule.
 

In Linz, Austria, fourth-seeded Dominika Cibulkova was upset by qualifier Eleni Daniilidou of Greece 6-2, 6-4 Tuesday in the first round of the Generali Ladies.

The 32nd-ranked Slovak, who reached the US Open quarterfinals last month, dropped serve four times and faced eight more break points.

Also, Sybille Bammer of Austria beat Anna Chakvetadze 7-5, 6-0. The Russian, who won her eighth career title in Slovenia in July, failed to convert eight of 10 break chances and won just six points on her serve in the second set.

In other first-round matches, ninth-seeded Sara Errani defeated Sesil Karatantcheva 6-2, 6-2, while Czech qualifier Renata Voracova beat Alize Cornet of France 6-1, 6-3.

Germany’s Julia Goerges, who won her first WTA title in nearby Bad Gastein in July, beat Polona Hercog, 6-4, 4-6, 6-4, and Switzerland’s Patty Schnyder eased past Gisela Dulko 6-2, 6-3.

Carla Suarez Navarro defeated fellow Spaniard Arantxa Parra Santonja 6-3, 6-3, and Barbora Zahlavova Strycova of the Czech Republic rallied to beat Anastasija Sevastova of Latvia 6-7 (5), 6-1, 6-4.
 

In Osaka, Japan, four-time champion Kimiko Date Krumm of Japan beat 16-year-old British qualifier Laura Robson 6-3, 6-3 to reach the second round of the Japan Women’s Open on Tuesday.

Date Krumm ousted Maria Sharapova and Daniela Hantuchova two weeks ago at the Pan Pacific Open, where she turned 40, and wasn’t prepared to underestimate Robson in their first meeting.

“Laura is very young and has a lot of potential so I really needed to focus a lot today,” said Date Krumm.

Third-seeded Shahar Peer of Israel beat Misaki Doi of Japan 6-2, 6-3, and No. 7 Iveta Benesova of the Czech Republic downed qualifier Christina McHale of the United States 6-4 6-3.