Karen Khachanov and Andrey Rublev helped Russia open the inaugural Davis Cup Finals with a 3-0 victory over defending champions Croatia in Madrid on Monday.
World No17 Khachanov clinched the point for Russia by fighting back to beat Croatian NoBorna Coric 6-7 (4/7), 6-4, 6-4, after Rublev had earlier seen off Borna Gojo 6-3, 6-3.
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“When you’re playing not only for yourself, but for your country, you have to fight harder,” said Khachanov.
Russia, who are without US Open runner-up Daniil Medvedev due to exhaustion, were to play Spain on Tuesday when victory over Rafael Nadal’s side in their second Group B tie would wrap up a place in the quarter-finals.
The 18 nations have been split into six groups of three at the Caja Magica, with the pool winners and two best runners-up to play in the last eight of the first edition of the revamped tournament.
The teams face off in two best-of-three-set singles matches and one doubles rubber in each tie.
Khachanov and Rublev completed the clean sweep later on Monday with a 7-6 (7/3), 6-4 doubles win over Ivan Dodig and Nikola Mektic.
Canada claimed a 2-1 victory over well-fancied Italy to strike first in Group F.
World No12 Fabio Fognini slumped to a 7-6 (7/5), 7-5 defeat by Vasek Pospisil, ranked 150th, before rising star Denis Shapovalov edged out Matteo Berrettini 7-6 (7/5), 6-7 (3/7), 7-6 (7/5).
“I’m really happy to get the win against a player like Matteo who has had such a good season,” said Shapovalov.
Italy, who won their only Davis Cup title in 1976, were the favourites in Group F with Fognini and Berrettini both having enjoyed excellent seasons.
The 20-year-old Shapovalov saved three set points before snatching the first set in a tie-break, only for Berrettini to level the match in a second-set breaker.
A clash without a single break of serve was decided by another tie-break, with Shapovalov reeling off the last three points to win after two hours and 52 minutes on court.
Berrettini and Fognini boosted Italy’s hopes of making the quarters with a hard-fought doubles success over Shapovalov and Pospisil, winning 6-2, 3-6, 6-3.
Canada were to take on the US on Tuesday, with Italy facing the Americans the following day.
Belgium made a victorious start in Group D with back-to-back singles wins against Colombia.
The South Americans are playing at the top level of Davis Cup tennis for the first time, having never played in the old World Group.
Steve Darcis saw off Santiago Giraldo 6-3, 6-2, before world No11 David Goffin had to battle back from a set down to avoid a shock against 194th-ranked Daniel Elahi Galan Riveros, winning 3-6, 6-3, 6-3.
But the world No1 doubles pairing of Juan Sebastian Cabal and Robert Farah grabbed a historic win for Colombia by battling past Sander Gille and Joran Vliegen 6-7 (5/7), 6-4, 7-6 (7/3).
