Kylian Mbappe scored his 23rd goal of the season in La Liga to help Real Madrid claim a battling 2-0 win at Valencia on Sunday and close the gap to leaders Barcelona to one point.

Third-place Atletico Madrid slumped to a 1-0 defeat at home to Real Betis, three days after thrashing the Andalusian side in the Copa del Rey, falling further away from the top two.

After Spanish champions Barca had beaten Mallorca on Saturday, Alvaro Arbeloa's Madrid eked out a tight victory at Mestalla to keep the pressure on their arch-rivals.

Missing suspended forward Vinicius Junior and injured midfielder Jude Bellingham, Los Blancos lacked sparkle but did enough to claim three points on Spain's east coast.

Alvaro Carreras put the visitors ahead midway through the second half and Mbappe struck late on to seal their win.

"It was going to be a game where we had to have a lot of patience. I think it was a win that came because of how solid we were, and our focussed performance," said Arbeloa.

"I think that we were fair winners."

England international Trent Alexander-Arnold made his return after injury as a substitute in the second half of Madrid's victory.

Arda Guler and Mbappe had chances in the first half, while Madrid right-back David Jimenez, from the club's youth academy, came closest to scoring but was denied by goalkeeper Stole Dimitrievski.

Midway through the second half, Carreras conjured a goal out of nothing to give Madrid the lead.

Coming in from the left, the defender used his weaker right foot to stroke the ball inside Dimitrievski's near post.

Valencia might have levelled but Lucas Beltran's effort on the stretch clipped the post.

Madrid eventually secured the three points in stoppage time as Brahim Diaz teed up La Liga's top scorer Mbappe to finish from close range.

"Right now he's the best player in the world, for what he's showing day after day and game after game," said Arbeloa, who reiterated that Mbappe could live up to his boyhood idol Cristiano Ronaldo's legacy at Real Madrid.

"As I've said before, it seemed like Cristiano was something alien, impossible to equal, and that nobody would get close, but Kylian is on a good path... it's not easy, obviously, but if anyone can, it's Kylian."

Valencia's fans, some of whom had waved white handkerchieves during the match in protest at the club's situation, headed for the exits with Los Che 17th, one point above the drop zone.

"It's normal that (the fans) are nervous, I would be too," admitted Valencia captain Jose Gaya. (AFP)