Novak Djokovic made a comfortable return to action on Tuesday as the defending champion moved into the last 16 of the Shanghai Masters with a straight-sets victory over Italy’s Fabio Fognini.

The world No1, playing his first match since losing the US Open final to Stan Wawrinka a month ago, beat Fognini 6-3, 6-3 in an hour and a quarter.

Djokovic missed the China Open last week because of an elbow injury but there was little indication of the top seed being rusty.

There were also wins for the sixth seed, Gaël Monfils, and the ninth-seeded Jo-Wilfried Tsonga, last year’s beaten finalist but the No8 seed, Marin Cilic, crashed out. Monfils got past Kevin Anderson 7-6, 6-3 and Tsonga was a 6-3, 7-6 victor over Janko Tipsarevic, while Cilic went down 3-6, 6-3, 6-2 against Alexander Zverev.

Two seeds were eliminated in the first round, with David Ferrer (10th) and Richard Gasquet (14th) being beaten by Feliciano López and Grigor Dimitrov respectively.

The other seeds made it safely through as David Goffin (11th) came from behind to defeat the wildcard Juan Martin del Potro, Nick Kyrgios (12th) overcame Sam Querrey, Lucas Pouille (13th) got the better of Fernando Verdasco and Roberto Bautista Agut (15th) beat Bernard Tomic.

Kyrgios said he had been bored during the Querrey match, which he won 6-4, 6-4.

The Australian, who won the Japan Open on Sunday, was quoted by the BBC as saying: “I was just a bit bored at times. I was feeling very tired. It was just tough. I’m just tired so maybe I just wanted to get the job done.”

Others to progress were the 2014 finalist Gilles Simon, Jack Sock, Paolo Lorenzi and Marcel Granollers.