Vinicius Junior scored a hat-trick to help Real Madrid bounce back from two consecutive home defeats with a 4-0 win over Osasuna in LaLiga Saturday, but defender Eder Militao suffered a severe knee injury.
Later Villarreal rose provisionally third with a 3-0 win at home against Alaves.
Hammered by Barcelona in a league Clasico and then outplayed by AC Milan in the Champions League, Carlo Ancelotti's Real side badly needed this confidence-boosting victory at Santiago Bernabeu.
The Spanish and European champions thrashed Osasuna thanks to Vinicius' treble, while Jude Bellingham scored his first goal of the season for Los Blancos.
However, Real's superstar striker Kylian Mbappe failed to find the net again and has scored one goal in his last seven matches.
Brazilian center-back Militao ruptured his cruciate ligament in his right knee and is set to miss the rest of the season, while Rodrygo Goes and Lucas Vazquez were also brought off hurt.
"It's horrible to see these injuries, especially Militao's," said Bellingham, of his team-mate who missed most of last season with a similar injury in his left knee.
"He has fought so hard to come back and be here with us...it breaks your heart."
Second-placed Real reined in Barca's lead at the top of LaLiga to six points before the Catalans visit Real Sociedad Sunday.
"Vinicius made the difference again, as he has done on many occasions," Real coach Ancelotti told reporters.
The Brazilian finished second in the Ballon d'Or voting despite being favorite to win the award at the end of October, losing out to Manchester City midfielder Rodri.
"(Not winning) the Ballon d'Or is a small detail that has not affected him, given what we've seen," added Ancelotti.
Militao was taken off on a stretcher before the half-hour, holding the back of his right knee, after going to ground in Osasuna's area.
With David Alaba, Aurelien Tchouameni and Dani Carvajal out hurt already, his departure was particularly bad news for Real.
Ancelotti replaced Militao with 21-year old defender Raul Asencio, making his debut after progressing through the youth academy.
Despite the setbacks, Real took the lead in the 34th minute when Bellingham teed up Vinicus, who whipped home at the near post.
England international Bellingham, whose goals were vital for Real last season, broke his duck this campaign with a fine lob after Asencio played a long ball to send him running through on goal.
Osasuna, fifth, had fought well in the opening stages but rapidly faded.
Vinicius netted his second after Real goalkeeper Andriy Lunin, in for the injured Thibaut Courtois, found the forward with a long ball.
He rounded the goalkeeper to finish.
The winger netted his ninth goal in six matches across all competitions to complete his hat-trick.
Brahim Diaz won the ball deep in Osasuna territory and teed up Vinicius for a simple finish to complete the rout.
"I'm very pleased with the goals, but I feel sad that Militao has to go through that again," said Vinicius.
After Vinicius was replaced in the final stages Mbappe played in his preferred position on the left but was unable to find the net as his personal travails continued, even as Real’s problems eased.
"(Mbappe) combined well...he didn't score, but he was always there," said Ancelotti.
"Before and after (this run) he will score again, without a doubt.
"Today Vini and Bellingham scored, in the next game he could score."
Los Blancos' clean sheet helped end a run of nine goals conceded in three consecutive home matches.
Villarreal continued their strong start to the season with a comfortable home victory over Alaves.
Ilias Akhomach, who was later taken off injured, Dani Parejo with a penalty and substitute Santi Comesana struck for the hosts.
Villarreal's match against Rayo Vallecano last weekend was postponed because of the devastating flooding in the Valencia region after a huge storm.
The east coast club, usually playing in bright yellow, wore a special black kit in tribute to the victims, with the death toll standing at least at 220.
RESULTS
Leganes 1 (De la Fuente 82-P) Sevilla 0
Real Madrid 4 (Vinicius 34, 61, 69, Bellingham 42) Osasuna 0
Villarreal 3 (Akhomach 38, Parejo 81-P, Comesana 90) Alaves 0
Friday
Vallecano 1 (McKenna 90+2-og) Las Palmas 3 (Silva 6, Aridane 62-og, Fuster 66)
Espanyol v Valencia postponed