Tsitsipas strolls into last-16
Monaco - Stefanos Tsitsipas made a winning start to the Monte Carlo Masters on Tuesday after the world No 5 cruised past Aslan Karatsev 6-3, 6-4 and into the last-16.
Greek Tsitsipas, who had been given a bye into the second round, took just one hour and 24 minutes to beat 29th-ranked Russian Karatsev.
The 22 year old exploited a whopping 32 unforced errors from Karatsev to set up a clash with either Australian John Millman or Chile's Cristian Garin.
Novak Djokovic meanwhile will face Jannik Sinner in his second round match after the up-and-coming Italian saw off Spain's Albert Ramos-Vinolas in straight sets 6-3, 6-4.
Teenager Sinner has risen to 22nd in the world rankings after reaching the final of the Miami Open earlier this month.
Medvedev tests positive
Earlier on Tuesday Daniil Medvedev pulled out of the tournament after testing positive for COVID-19.
World No 2 Medvedev tested positive on Monday having practised with Rafael Nadal the day before.
Organisers, contacted by AFP, declined to comment on whether third seed Nadal risked being identified as a 'close contact' of Medvedev and forced to quarantine. Nadal is seeded to meet Djokovic in the final as he chases a 12th triumph in Monte Carlo, a key clay court tournament in the run up to the French Open.
"It's a big disappointment not to play in Monte-Carlo. My focus is now on recovery and I look forward to getting back out on Tour as soon and as safely as possible," the Russian world No 2 said in an ATP statement.
Medvedev has been placed in quarantine, 'and continues to be monitored by the Tournament Physician and ATP Medical Team', the statement added.
Medvedev, a finalist in Monte Carlo in 2019, had a first round bye and has been replaced in the singles second round where he was due to play either Fili or Nikoloz Basilashvili on Wednesday.
As a Monaco resident the 25 year old was allowed to reside at his home, in contrast to other players who are living in strict bio-secure bubble accommodation. Runner-up to Novak Djokovic in the Australian Open this year, he took over the No 2 ATP ranking with his victory at Marseille in March.
He was due on court in Monte Carlo following his upset quarterfinal defeat to Spaniard Roberto Bautista Agut in the Miami Open at the start of the month.