The Latest on the French Open (all times local):
When it comes to hitting aces, big-serving Ivo Karlovic has no rival.
At 37, the lanky Croatian player proved it again to drag himself out of a tough battle with Jordan Thompson and become the oldest male player to reach the third round at a Grand Slam since Jimmy Connors at the 1991 U.S. Open. Connors was 39 when he progressed to the semifinals at Flushing Meadows that year.
The 27th-seeded Karlovic produced 41 aces in his 6-7 (2), 6-3, 7-6 (3), 6-7 (4), 12-10 win over the Australian wild-card entry, including three in the final game.
There still were some hiccups for Stan Wawrinka in the second round of the French Open. All in all, though, things went a lot more smoothly than in his opening match.
After needing to come back and win in five sets to barely avoid becoming the first defending champion in tournament history to lose in the first round, Wawrinka moved into the third with a 7-6 (7), 6-3, 6-4 victory over 93rd-ranked Taro Daniel of Japan on Wednesday.
In the tiebreaker, the third-seeded Wawrinka found himself facing two set points while trailing 6-4. But he erased both of those and eventually pulled out the set, then quickly went up a break in the second and was on his way.
Wawrinka said his play against Daniel had "many ups and downs," but that he's "ready to step it up."
Wawrinka compiled a 62-21 advantage in winners and will now face No. 30 Jeremy Chardy of France for a spot in the round of 16.
Teenager Alexander Zverev has completed his first career win in the main draw of the French Open.
The 19-year-old German, who is regarded as one of the most talented youngsters on the circuit, advanced to the second round of the clay-court Grand Slam with a 5-7, 6-2, 7-6 (6), 7-5 win over Pierre-Hugues Herbert. Their match was suspended at the start of the fourth set on Tuesday because of darkness.
The 41st-ranked Zverev is playing for the second time at the Roland Garros after losing in the qualifying stages last year. He will be up against another Frenchman, Stephane Robert, in the second round.
Fourth-seeded Garbine Muguruza is through to the third round of the French Open, beating wild-card entry Myrtille Georges 6-2, 6-0.
A two-time quarterfinalist in Paris, the 2015 finalist at Wimbledon says "I really want to win here."
Fifth-seeded Kei Nishikori advanced to the second round at the French Open by beating Andrey Kuznetsov 6-3, 6-3, 6-3.
Nishikori, a U.S. Open finalist in 2014, reached the quarterfinals in Paris last year.
There was also a second-round win for a Japanese player in the women's draw, with Naomi Osaka beating Mirjana Lucic-Baroni 6-3, 6-3.
Two-time Wimbledon champion Petra Kvitova, 2009 French Open winner Svetlana Kuznetsova and 2014 finalist Simona Halep have all advanced to the third round at Roland Garros.
The 10th-seeded Kvitova beat Hsieh Su-Wei 6-4, 6-1. Kvitova, who reached the semifinals at Roland Garros in 2012, looked more comfortable than in her first-round match.
Kvitova says "I'm feeling good. I'm healthy, and that's important."
The sixth-seeded Halep had to rally from 4-1 down in the first set to beat Zarina Diyas 7-6 (5), 6-2, while Kuznetsova defeated Heather Watson 6-1, 6-3.
Tightened security measures at the French Open, with multiple pat-downs and bag checks, are making getting into Roland Garros a bit of a chore.
There were long lines on Wednesday morning as spectators waited — mostly patiently — to be cleared for entry into the smallest of the four Grand Slam tournaments.
Extra precautions introduced following deadly attacks in Paris in November include an initial pat-down, bag check and scan with a metal detector before reaching Roland Garros, followed by another more thorough search at the gates.
Security has also been stepped up for soccer's European Championship in 10 French cities starting next month.
The French Open is finally basking under blue skies after three opening days of damp, cold weather.
Those already out on court Wednesday include fifth-seeded Kei Nishikori, former French Open champion Svetlana Kuznetsova and 2014 finalist Simona Halep.
Halep is on Court Philippe Chatrier against Zarina Diyas. On Court 2, Kuznetsova is facing Heather Watson, while Nishikori is playing Andrey Kuznetsov Court 1.