Overall, Medvedev won 28 of 31 first-service points while collecting 16 winners against just three unforced errors.
Sinner topped American Ben Shelton 7-6 (2), 7-5; Gojo ousted Russia's Aslan Karatsev 6-3, 6-3; and Monfils downed Daniel Altmaier of Germany 6-4, 6-4.
In second-round action, fifth-seeded German Alexander Zverev downed Great Britain's Cameron Norrie 6-2, 6-4, while No.
Swiss Indoors BaselArgentina's Tomas Martin Etcheverry rallied to beat Andy Murray of Great Britain 6-7 (5), 6-3, 6-2 in a second-round match at Basel, Switzerland.
4 seed Hurbert Hurkacz of Poland also won his second-round match, sweeping German Jan-Lennard Struff 6-1, 6-4.
Persons:
Russia's Daniil Medvedev, Sebastian Korda, Aly, Daniil Medvedev, Frenchman Arthur Fils, Fils, Medvedev, Italy, Borna Gojo, Gael Monfils, Sinner, Ben Shelton, Gojo, Russia's Aslan Karatsev, Monfils, Daniel Altmaier, Alexander Zverev, Britain's Cameron Norrie, Karen Khachanov, Jiri Lehecka, Basel Argentina's Tomas Martin Etcheverry, Andy Murray of, Etcheverry, Murray, Lennard, Casper Ruud, Taylor Fritz, Felix Auger, France's Ugo Humbert
Organizations:
Shanghai, Sports City Arena, U.S, REUTERS, Erste Bank, Swiss, Basel Argentina's, Thomson
Locations:
Shanghai, China, Vienna, Croatian, Germany, Russia, Czech, Andy Murray of Great Britain, Basel, Switzerland, Poland