New York - World number two Roger Federer will continue his bid for a sixth US Open title when he takes on Belgium's Steve Darcis in the second round at the Arthur Ashe Stadium on Thursday.
Swiss Federer, who has been in sizzling form since reaching the Wimbledon finals, swept past Argentina's Leonardo Mayer 6-1 6-2 6-2 in his opening match at the US National Tennis Centre.
"I feel good now," Federer, who is seeking to add to his record 17 grand slam titles, said on Tuesday. "I actually wasn't so confident yesterday and today. I just felt like maybe could be one of those matches I just couldn't see coming.
"Thankfully I took this match extremely serious," said the 34-year-old Swiss, who had fended off five match points in beating Mayer last year in Shanghai
Also in action on Thursday will be third-seeded Scot Andy Murray and fifth seed Stan Wawrinka of Switzerland.
Murray, who advanced into the second round with a four-set win over controversial Australian Nick Kyrgios, faces French left-hander Adrian Mannarino while Wawrinka comes up against South Korean teenager Chung Hyeon.
In the women's championship, second-seeded Romanian Simona Halep plays against Ukrainian Kateryna Bondarenko before fourth seed Caroline Wozniacki of Denmark meets Czech Petra Cetkovska.
Also in action on Thursday will be big-serving Czech Petra Kvitova, the fifth seed, who faces American Nicole Gibbs in a second-round match at Louis Armstrong Stadium.
US Open results on Wednesday, the third day of the 2015 tournament at Flushing Meadows (x denotes seeded player):
Men
2nd rd
Novak Djokovic (SRB x1) bt Andreas Haider-Maurer (AUT) 6-4, 6-1, 6-2
Andreas Seppi (ITA x25) bt Teimuraz Gabashvili (RUS) 3-6, 6-3, 7-6 (7/3), 6-1
Roberto Bautista Agut (ESP x23) bt Pablo Carreo-Busta (ESP) 4-6, 6-4, 6-0, 2-6, 6-4
David Goffin (BEL x14) bt Ricardas Berankis (LTU) 5-7, 6-4, 3-6, 6-2, 6-1
Milos Raonic (CAN x10) bt Fernando Verdasco (ESP) 6-2, 6-4, 6-7 (5/7), 7-6 (7/1)
Feliciano Lopez (ESP x18) bt Mardy Fish (USA) 2-6, 6-3, 1-6, 7-5, 6-3
Fabio Fognini (ITA x32) bt Pablo Cuevas (URU) 6-3, 6-4, 6-4
Rafael Nadal (ESP x8) bt Diego Schwartzman (ARG) 7-6 (7/5), 6-3, 7-5
Benot Paire (FRA) bt Marsel Ilhan (TUR) 6-3, 3-6, 6-4, 6-3
Tommy Robredo (ESP x26) bt Samuel Groth (AUS) 6-4, 7-6 (7/3), 6-4
Jo-Wilfried Tsonga (FRA x19) bt Marcel Granollers (ESP) 6-3, 6-4, 6-3
Sergiy Stakhovsky (UKR) bt Illya Marchenko (UKR) 6-4, 7-6 (7/2), 4-6, 6-4
Marin Cilic (CRO x9) bt Evgeny Donskoy (RUS) 6-2, 6-3, 7-5
Mikhail Kukushkin (KAZ) bt Grigor Dimitrov (BUL x17) 6-3, 7-6 (7/2), 2-6, 4-6, 6-4
Jeremy Chardy (FRA x27) bt Martin Klizan (SVK) 7-5, 6-4, 7-6 (7/1)
David Ferrer (ESP x7) bt Filip Krajinovic (SRB) 7-5, 7-5, 7-6 (7/4)
Women
2nd rd
Serena Williams (USA x1) bt Kiki Bertens (NED) 7-6 (7/5), 6-3
Bethanie Mattek-Sands (USA) bt Coco Vandeweghe (USA) 6-2, 6-1
Madison Keys (USA x19) bt Tereza Smitkov (CZE) 6-1, 6-2
Agnieszka Radwanska (POL x15) bt Magda Linette (POL) 6-3, 6-2
Belinda Bencic (SUI x12) bt Misaki Doi (JPN) 5-7, 7-6 (7/3), 6-3
Venus Williams (USA x23) bt Irina Falconi (USA) 6-3, 6-7 (2/7), 6-2
Anett Kontaveit (EST) bt Anastasia Pavlyuchenkova (RUS x31) 7-5, 6-4
Madison Brengle (USA) bt Anna Tatishvili (USA) 6-3, 6-2
Darya Kasatkina (RUS) bt Ana Konjuh (CRO) 6-4, 6-4
Kristina Mladenovic (FRA) bt Bojana Jovanovski (SRB) 7-5, 6-1
Elina Svitolina (UKR x17) bt Kaia Kanepi (EST) 6-3, 6-4
Ekaterina Makarova (RUS x13) bt Lauren Davis (USA) 6-1, 6-2
Roberta Vinci (ITA) bt Denisa Allertov (CZE) 2-6, 6-3, 6-1
Mariana Duque (COL) bt Ocane Dodin (FRA) 6-1, 5-7, 6-2
Eugnie Bouchard (CAN x25) bt Polona Hercog (SLO) 6-3, 6-7 (2/7), 6-3
Dominika Cibulkova (SVK) bt Jessica Pegula (USA) 5-7, 7-5, 6-3