Thiem crashes out in Rio, Del Potro makes winning return

Dominic Thiem suffered a shock loss in the Rio Open first round, while Juan Martin del Potro marked his return with a win on Tuesday.

Thiem, the top seed and 2017 champion in Rio de Janeiro, was stunned 6-3 6-3 by Serbian Laslo Djere at the ATP 500 event.

Djere, the 23-year-old world number 90, broke serve five times in an impressive performance.

Thiem was one of six seeds to fall at the rain-hit tournament.

Another major upset at the #RioOpen: Djere beats Thiem, 6/3 6/3. pic.twitter.com/flvnjPugbR

— Rio Open (@RioOpenOficial) February 20, 2019

Fabio Fognini, the Italian second seed, was comfortably beaten by Canadian wildcard Felix Auger-Aliassime 6-2 6-3.

Marco Cecchinato was edged by Aljaz Bedene 7-5 7-6 (7-1) and Dusan Lajovic was thrashed by Cameron Norrie 6-2 6-1.

The seventh-seeded Malek Jaziri went down to Federico Delbonis 6-3 7-5, while Nicolas Jarry lost to Roberto Carballes Baena 6-3 6-7 (5-7) 7-6 (8-6) in a three-hour marathon at the clay-court event.

Joao Sousa was the only seed to progress, while there were also wins for the likes of Albert Ramos-Vinolas and Christian Garin.

At the Delray Beach Open, Del Potro made his return from a knee injury with a 6-3 7-5 win over Yoshihito Nishioka.

Playing for the first time since October, the 2011 champion sent down 12 aces to win in one hour, 51 minutes.

Unlike in Rio, it was a decent day for the seeds on the hard-courts in Florida.

John Isner got past Peter Polansky 6-3 7-6 (7-4), Steve Johnson overcame Jason Jung 7-6 (7-3) 6-4 and Andreas Seppi beat Bernard Tomic 6-4 7-5.

@SJohnson_89 opens up his #DBOpen campaign with a 7-6(3), 6-4 win over J. Jung! See you in R2, Stevie! #USTennis : Andrew Patron/@DelrayBeachOpen pic.twitter.com/h7Tptx7t6z

— USTA (@usta) February 19, 2019

Adrian Mannarino was a comfortable 6-2 6-2 winner over Brayden Schnur, who was coming off a run to the New York Open final.

Reilly Opelka, who won his maiden ATP Tour title in New York, advanced with a 6-4 6-0 victory over Tennys Sandgren.

However, defending champion Frances Tiafoe went down to qualifier Dan Evans 3-6 7-6 (7-1) 7-5 and Taylor Fritz was beaten by Mackenzie McDonald 3-6 6-4 6-3.