Dominic Thiem resumed his season with a first-round win at the Rio Open, while Jack Sock finally ended his wait for another victory.

Thiem, last in action in an Australian Open final loss to Novak Djokovic, returned with a 6-2 4-6 6-1 victory over wildcard Felipe Meligeni Alves on Tuesday.

The 2017 champion of the ATP 500 event played on clay in Brazil, top seed Thiem grabbed two breaks of serve in the deciding set.

Having started 2020 with four losses in five matches, Borna Coric found a victory by overcoming Juan Ignacio Londero 7-6 (7-5) 7-5.

Dusan Lajovic joined Thiem and Coric as the three seeds to win, but two fell in the opening round.

Casper Ruud, coming off a title win at the Argentina Open, went down to qualifier Gianluca Mager 7-6 (7-4) 7-5.

Guido Pella, the 2016 runner-up, was edged by Thiago Monteiro 5-7 6-4 7-6 (7-3) after just over three hours.

At the Delray Beach Open, Sock claimed his first non-Laver Cup singles win since late 2018.

The American 2017 champion, a wildcard, battled past last year's winner Radu Albot 3-6 6-3 7-6 (7-2), saving a match point in the final set and breaking down in tears following his victory.

Canadian second seed Milos Raonic brushed past lucky loser Denis Istomin 6-2 6-2 and Reilly Opelka served 20 aces in a 6-7 (5-7) 6-4 7-6 (7-4) victory over Ernests Gulbis.

Ugo Humbert, the French sixth seed, battled through, while third seed Taylor Fritz fell to qualifier Cameron Norrie 6-4 6-7 (4-7) 6-4.

Jack Sock's struggles continued with a first-round loss at the New York Open, while Tennys Sandgren also fell on Monday.

Now unranked, Sock needed a wildcard into the ATP 250 tournament and suffered a 6-3 6-4 loss to fellow American Marcos Giron.

A former world number eight, Sock won just one singles match last year – at the Laver Cup.

Giron created 10 break points and converted four on his way to victory in 76 minutes.

Coming off a run to the Australian Open quarter-finals, Sandgren suffered a 6-7 (5-7) 6-3 7-6 (7-3) loss to Steve Johnson.

Sandgren squandered seven match points in a last-eight loss to Roger Federer in Melbourne and the fifth seed was edged by Johnson.

Sixth seed Miomir Kecmanovic and Italian veteran Andreas Seppi posted wins over Tommy Paul and Damir Dzumhur respectively.

At the Argentina Open, Casper Ruud was the only seed in action and eased past Pablo Andujar 6-2 6-3.

Pablo Cuevas, Federico Delbonis and Thiago Monteiro also moved into the second round.

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