World No 1 Novak Djokovic overcame a “strange” lengthy rain delay to beat American Taylor Fritz 6-3, 7-6 (7/5) to reach the third round of the Italian Open on Tuesday.

Title holder Djokovic waited three hours to finish off the match despite Fritz’s efforts in the second set.

“It was a really strange match, to play in the rain, it was difficult,” the Serb said.

“It possibly helped me because the play was slower, and he has a good serve. He played really well. In these circumstances, you don’t know how much time it will go on for. If you have to eat, rest, or not. You have to do what feels best for you,” he added.

Djokovic, 33, playing his third tournament since winning his ninth Australian Open in February, will play Cameron Norrie or Alejandro Davidovich for a place in the quarter-finals.

Elsewhere, Canadian Felix Auger-Aliassime beat last year’s runner up Diego Schwartzman 6-1, 6-3 and will face either Federico Delbonis or David Goffin, who meet early on Wednesday.

Earlier, sixteenth seed Grigor Dimitrov crashed out in the first round when he was beaten in straight sets by Spanish qualifier Alejandro Davidovich Fokina.

The world No 48 saved two set points in the second set as he dismissed the 2014 semi-finalist Dimitrov 6-4, 7-6 (7/2) to win in one hour and 43 minutes.

Tenth seed Roberto Bautista Agut booked his place in the second round with a comfortable 6-3, 6-4 win over American Tommy Paul.

On the women’s side, Argentinian Nadia Podoroska, ranked 44 in the world, assured herself of a second round meeting with Serena Williams, playing her first event since the Australian Open, when she came from a set down to beat German Laura Siegemund 2-6, 7-6 (7/3), 6-1.

Madison Keys won the battle of the Americans when she overcame Sloane Stephens 4-6, 6-2, 7-5.

Results

MEN

Second round

Novak Djokovic (SRB) bt Taylor Fritz (USA) 6-3, 7-6 (7/5)

Felix Auger-Aliassime (CAN) bt Diego Schwartzman (ARG) 6-1, 6-3

Reilly Opelka (USA) bt Lorenzo Musetti (ITA) 6-4, 6-4

Kei Nishikori (JPN) bt Pablo Carreno Busta (ESP x11) – walkover

First round

Cameron Norrie (GBR) bt Roberto Carballes Baena (ESP) 6-4, 6-4

Alejandro Davidovich Fokina (ESP) bt Grigor Dimitrov (BUL x16) 6-4, 7-6 (7/2)

Matteo Berrettini (ITA x9) bt Nikoloz Basilashvili (GEO) 4-6, 6-2, 6-4

John Millman (AUS) bt Dusan Lajovic (SRB) 6-3, 6-4

Lorenzo Sonego (ITA) bt Gael Monfils (FRA x14) 6-4, 5-7, 6-4

Roberto Bautista Agut (ESP x10) bt Tommy Paul (USA) 6-3, 6-4

Denis Shapovalov (CAN x13) bt Kamil Majchrzak (POL) 6-1, 6-3

WOMEN

First round

Yaroslava Shvedova (KAZ) bt Martina Trevisan (ITA) 0-6, 7-6 (7/4), 7-6 (8/6)

Caroline Garcia (FRA) bt Elisabetta Cocciaretto (ITA) 7-6 (10/8), 6-2

Veronika Kudermetova (RUS) bt Elise Mertens (BEL x14) 4-6, 6-2, 6-3

Barbora Krejcikova (CZE) bt Zheng Saisai (CHN) 6-2, 6-0

Madison Keys (USA) bt Sloane Stephens (USA) 4-6, 6-2, 7-5

Garbine Muguruza (ESP x12) bt Patricia Tig (ROM) 6-1, 6-2

Bernarda Pera (USA) bt Tamara Zidansek (SLO) 6-3, 6-2

Nadia Podoroska (ARG) bt Laura Siegemund (GER) 2-6, 7-6 (7/3), 6-1

Kristina Mladenovic (FRA) bt Belinda Bencic (SUI x10) 6-3, 6-4