Jo-Wilfried Tsonga claimed his first victory since February to knock Guido Pella out of the European Open, while defending champion Damir Dzumhur suffered a first-round exit at the Kremlin Cup.
Tsonga was beaten by Peter Gojowczyk at the Moselle Open last month in the first match of his comeback from knee surgery, but was back in business with a 7-5 5-7 7-6 (7-5) victory in Antwerp on Tuesday.
The Frenchman won the tournament in Belgium last year, but has not added to his tally since, enduring a frustrating spell off the circuit due to injury.
Tsonga will face compatriot Gael Monfils in what should be an entertaining second-round encounter after the flamboyant sixth seed eased past wildcard Ruben Bemelmans 6-0 6-3.
Gilles Simon was another French player who moved into the last 16 at the expense of Sergiy Stakhovsky on a day which saw eighth seed Robin Haase bow out with a straight-sets defeat to qualifier Ilya Ivashka.
Sixth seed Dzumhur's reign as champion in Moscow was ended by Egor Gerasimov, the world number 217 from Belarus pulling off a 6-1 6-7 (5-7) 6-2 upset.
Nick Kyrgios responded to his first-round exit at the Shanghai Masters by defeating Andrey Rublev 6-3 4-6 6-4, but eighth seed Martin Klizan went down 6-1 7-6 (8-6) to Andreas Seppi.
Benoit Paire, Dusan Lajovic, Evgeny Donskoy, Ricardas Berankis and Mirza Basic also negotiated their way into the second round.
Fifth seed Lucas Pouille made an early exit in the Stockholm Open, losing 6-4 6-4 to Tennys Sandgren.
Fernando Verdasco and Hyeon Chung had no such trouble, beating Matthew Ebden and Taylor Fritz respectively in straight sets.
|Sarri questions Chelsea motivation after Arsenal surrender|
|Emery urges Arsenal to find balance after downing Chelsea|
|Koscielny hails Arsenal fighting spirit in Chelsea win|
|Pellegrini: It was not a good idea for Arnautovic to play|
|Iran v Oman: We´re not satisfied yet, says Al Mahaijri|
|Carbery sends Munster through and ends Exeter´s lingering Champions Cup hopes|
|Dyche defiant despite offside call|
|Hasenhuttl rates Everton win as Southampton´s best|
|Benitez looking up the table after Schar inspires win over Cardiff|
|RB Leipzig 0 Borussia Dortmund 1: Witsel restores six-point cushion|
|Swansea City 1 Sheffield United 0: McBurnie punishes wasteful Blades|
|Cardiff sign Sala from Nantes for club-record fee|
|Arsenal 2 Chelsea 0: Lacazette and Koscielny fire Gunners to rousing derby win|
|Huesca 0 Atletico Madrid 3: Dominant Atleti keep pressure on Barca|
|Rashford arguably league´s best striker with Kane out - Solskjaer|
|Hafeez plays steady hand as Pakistan punish Proteas´ patient approach|
|Klopp: Exceptional Salah would have scored even more up front!|
|Suspected ´serious´ Verratti injury leaves Tuchel with mixed emotions|
|We needed to rediscover our best form - Ramos pleased for Real Madrid fans|
|City bought Guardiola four full-backs! - Mourinho aims dig at Man Utd transfer policy|
|Valverde ´not frustrated´ amid De Jong & Vela links|
|Championship Review: Leaders Leeds beaten at Stoke as Villa end Hull run|
|Bournemouth rode their luck, admits Howe|
|Barca boss Valverde calls for clarity on RFEF rules|
|Bears rack up 107 points in routing Enisei en route to quarter-finals|
|Paris Saint-Germain 9 Guingamp 0: Verratti injured for rampant champions|
|Solskjaer: I´ll remember managing United for the rest of my life|
|Palace win a ´massive relief´ for Liverpool boss Klopp|
|Salah fourth fastest to 50 goals in Premier League history|
|Real Madrid 2 Sevilla 0: Solari´s side take over third spot|
|Watford 0 Burnley 0: Wood denied winner by contentious call|
|Liverpool 4 Crystal Palace 3: Salah reaches 50 thanks to Speroni shocker|
|Newcastle United 3 Cardiff City 0: Schar double moves hosts out of bottom three|
|Southampton 2 Everton 1: In-form Saints steer clear of trouble|
|Bournemouth 2 West Ham 0: Wilson and King sink Pellegrini´s men|
|Manchester United 2 Brighton and Hove Albion 1: Record-breaking win for Solskjaer|
|Pelicans star Anthony Davis out for one to two weeks with sprained finger|
|Verratti hobbles off for PSG against Guingamp|
|Brook ponders next move after missing out on Khan|
|Mick Schumacher: The Ferrari academy graduates who made it to F1|
|Thailand v China: Lippi aims to overcome War Elephants and reach last eight|
|I deserved red card, says Wolves boss Nuno|
|Mick Schumacher joins Ferrari Driver Academy|
|Jared Goff not worried about Superdome noise: ´When it´s loud, we love it´|
|Rooney urged Rashford to run at defenders|
|Former Springbok Lambie retires from rugby aged 28|
|Spygate: EFL confirms 11 clubs have made contact about Leeds|
|When it´s loud, we love it - Goff ready for New Orleans noise|
|Wolves 4 Leicester City 3: Jota hat-trick drama piles pressure on Puel|
|´Asparagus´ Zverev joins frustrated Djokovic in round four|
|Lowry takes Abu Dhabi title at the last after ding-dong Sterne battle|
|Rooney: United should go "all out" for Pochettino|
|Djokovic frustrated by ´unnecessary´ Australian Open floodlights|
|Jordan v Vietnam: Park expecting ´aggressive´ encounter|
|Serena and Halep book blockbuster, Osaka won´t throw in the towel|
|Brady: Mahomes has had ´spectacular season´|
|Halep not intimidated by Serena anymore|
|Farrell´s Six Nations preparations hit by thumb injury|
|Pogba confident Manchester United can reach top four|
|Alexander-Arnold embodies Liverpool spirit - Klopp|
|Stoinis shoots Stars to Melbourne derby victory|
|A-League Review: Glory held in stalemate as Sydney close the gap|
|DeMarcus Cousins ´felt like a kid on Christmas´ in Warriors debut|
|Alexander-Arnold signs long-term contract at Liverpool|
|Pochettino eyes Messi-esque role for Alli|
|Halep sets up mouth-watering Serena showdown by conquering Venus|
|Wilder-Fury II expected for April 27 or May - Warren|
|Celtics´ Kyrie Irving on technical: If someone questions your manhood, you got no choice|
|Serena would ´love´ Halep clash|
|Djokovic sees off Shapovalov at Aus Open|