WILLIAMS SISTERS ADVANCE

LONDON — Roger Federer and Serena Williams are making it look easy at Wimbledon — again.

Caroline Wozniacki is heading home early — again.

Federer and Williams cruised into the third round with straight-sets victories Wednesday, looking at home on the Centre Court where they have won 15 titles between them. Wozniacki still can’t seem to get comfortable at the All England Club — especially when there’s a swarm of bugs flying around her head. The Australian Open champ went out before the third round for the fourth time in seven years, losing 6-4, 1-6, 7-5 to Russian Ekaterina Makarova after complaining to the chair umpire about the insects that invaded No. 1 court during the second set.

No such problems for Federer, who won 35 straight points on his serve on route to beating Lukas Lacko of Slovakia 6-4, 6-4, 6-1. After serving out for the first set, Federer didn’t drop a single point on his serve in the second and kept that streak going until he was 30-0 up at 4-1 in the third — when Lacko finally sent a backhand winner down the line.

It was another dominant display by the eight-time champion, who lost just nine of 61 points on his serve in total and broke Lacko five times. “On certain days it goes better than others,” Federer said. “Sometimes your serve matches up better against certain players.”

Williams was nearly as good, losing just five of 32 points on her first serve in a 6-1, 6-4 win over Viktoriya Tomova. It was her 16th straight victory at Wimbledon, although she missed last year’s tournament while pregnant. Kristina Mladenovic advanced to a third-round meeting with Williams, beating Tatjana Maria 6-2, 6-2.

Wozniacki is still waiting to get past the round of 16 for the first time, despite fighting back from 5-1 down in the third set and saving four match points at 5-3. But she was broken again in the final game, becoming the fifth of the top eight women’s seeds to lose before the third round. Wozniacki said Makarova “got a little lucky” and “I would be very surprised if you saw her go far.”

Asked what she thought of those remarks, Makarova laughed and replied: “Yeah, maybe I was lucky today. Good for me. Thanks, God.”

Five-time champion Venus Williams — the No. 9 seed, at 38 the oldest woman in the draw — beat 141st-ranked qualifier Alexandra Dulgheru of Romania 4-6, 6-0, 6-1 after dropping the first set for a second straight match. Karolina Pliskova advanced to the third round for the first time with a 6-3, 6-3 victory over Victoria Azarenka. In the men’s draw, 13th-seeded Milos Raonic and No. 11 Sam Querrey advanced in straight sets. Gael Monfils overcame Paolo Lorenzi 3-6, 6-3, 7-6 (5), 7-6 (3) to set up a meeting with Querrey. Jan-Lennard Struff will face Federer after a 6-7 (5), 3-6, 7-6 (4), 7-6 (4), 13-11 comeback victory over Ivo Karlovic.

Day 3 at Wimbledon was prematurely ended by rain, leaving a number of matches incomplete.