Against Delbonis, an Argentine qualifier, Nadal saved four of the five break points he faced. He will take on Grigor Dimitrov in the next round.
Djokovic, who beat Rafael Nadal in the 2013 final and won the tournament again in 2015, could face the Spaniard in Sunday's final.
The ATP said Medvedev has been placed in isolation. His condition is being assessed by the tournament doctor and the ATP medical team.
Travaglia, seeded second in qualifying, dropped just three points on first serve to crush the 23-year-old Indian in 58 minutes on Saturday.
The Indian women players travel to Latvia for the World Group Play-offs tie, to be played on the indoor courts of National Tennis Centre Lielupe in Jurmala from April 16.
The clay-court Grand Slam tournament was set to start on May 23, but first-round matches will now get underway on May 30.
Sania has already qualified for the Tokyo Olympics based on her protected ranking before she took a break from the game due to pregnancy.
France began a third nationwide lockdown on Saturday which president Emmanuel Macron said he expected to end in mid-May - with Roland Garros set to start on the 23rd May till the 6th June.
Andreescu limped through 11 more points before she retired, crying, shaking her head and trailing 6-3, 4-0.
On Friday, the 19-year-old Italian became the fourth teenager to reach the Miami men’s final. The others: Novak Djokovic, Rafael Nadal and Andre Agassi.
The coronavirus has killed more than 320,000 people in the South American nation, with March being its deadliest month since the pandemic began.
The top-ranked Barty returned to the final by beating No. 5-seeded Elina Svitolina 6-3, 6-3 on Thursday.
No. 23-seeded Maria Sakkari upset Osaka 6-0, 6-4 in the quarterfinals of the Miami Open.
The WTA World No. 1 wins the final nine points to finish off the seventh-seeded Sabalenka in a three-set women's quarterfinal; men's top-seeded Medvedev reaches the quarters with a straight-set win over Tiafoe.
The world’s top-ranked player holds off 14th-seeded Victoria Azarenka of Belarus 6-1, 1-6, 6-2 in the last 16.
The top-ranked Medvedev held his final two service games despite being hobbled by cramps and beat Alexei Popyrin 7-6 (3), 6-7 (7), 6-4 in the third round at the Miami Open.
Osaka, ranked No. 2, has won 22 consecutive matches since her most recent defeat in February 2020, and she earned her fourth Grand Slam title at the Australian Open last month.
Rafael Nadal and Roger Federer withdrew because of injuries, and Novak Djokovic decided against making the trip from his native Serbia.
Barty is the defending champion as the 2019 winner. The tournament was canceled last year at the start of the coronavirus pandemic
The top-ranked Barty rallied from a big third-set deficit and overcame a match point to win her opening match against qualifier Kristina Kucova, 6-3, 4-6, 7-5.
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