Defending champion Djokovic fired his 15th ace on match point to defeat Querrey but his serve had been an issue earlier in their second-round encounter.
Garbine Muguruza made an imposing start to the WTA Finals by confidently swotting aside Czech Lucie Safarova 6-3, 7-6 (4) in their White Group opener on Monday.
Catalans will have to cope without their inspirational captain Andres Iniesta, the man who has pedigree when it comes to beating the Blues.
Marco Asensio's strike earned Real Madrid a 1-0 win over Espanyol to send them top of La Liga and Thomas Lemar scored his first goal for Atletico Madrid in a 2-0 victory at Getafe on Saturday.
Women's tennis's biggest names still remaining at the US Open take centre stage on Sunday with Grand Slam winners Maria Sharapova, Venus Williams, Garbine Muguruza and Petra Kvitova all appearing on Arthur Ashe Stadium.
Cristiano Ronaldo, Lionel Messi and Antoine Griezmann appear among the 55 nominees for the FIFPro 2016 World 11 released on Friday but England forward Wayne Rooney failed to make the shortlist for the first time. Portugal captain Ronaldo, led his country to victory at Euro 2016, while France forward Griezmann was the top player at the tournament. It is the first time that 25-year-old Griezmann has made the cut, but England captain Rooney is absent for the first time in the competition's 12-year history, after England crashed out of Euro 2016 to lowly Iceland.
Barcelona were held to a 1-1 draw at relegation-fighting Las Palmas on Thursday in an unexpected setback that left them with a five-point lead in La Liga ahead of their top-of-the-table showdown with Atletico Madrid this weekend.
Some of the most memorable ones from the one-month tournament.
In England, the celebrations went on at Leicester City as they marked their fairytale Premier League success with another win while champions Juventus' long unbeaten streak in Italy came to an end.
Striker Luis Suarez scored one goal and missed two second-half penalties as Ajax Amsterdam beat nine-man FC Timisoara 2-1 in Romania on Wednesday to reach the knockout stage of the Europa League.
Get the latest updates from all the action in South Africa.
Real Madrid's Welsh winger Gareth Bale has joined Lionel Messi and Cristiano Ronaldo in the race for FIFA's Ballon d'Or award.
News of all that's transpired on and off the football field
News of all that's transpired on and off the football field.
Paraguay starlet Sergio Diaz is thrilled to be moving to Real Madrid but has yet to find out if he will join the first team squad for pre-season training or play for the club's Castilla reserve side, he told Spanish media. Real have yet to unveil the 18-year-old officially but Marca reported that striker has joined the Spanish giants from Cerro Porteno in a six million euros ($6.64 million) transfer deal to become the first Paraguayan to play for the European champions.
Ajax closed the gap with Dutch league leaders Twente Enschede to one point after Luis Suarez and Marko Pantelic earned them a 2-0 win at struggling Willem II Tilburg on Wednesday.
Luka Modric pulled one back for Zinedine Zidane's shellshocked side with a brilliant strike from distance early in the second half before substitute Vinicius Jr reduced the deficit to one goal.
Barcelona seized control of their King's Cup quarter-final tie against Atletico Madrid when Lionel Messi followed up his saved penalty to score and secure a 1-0 first-leg victory at the Nou Camp on Wednesday.
Serena, a six-times champion in New York who is seeded 17th, will start her campaign against Polish world number 60 Magda Linette and could face Venus in the third round before a possible fourth-round showdown with Romanian top seed Halep.
La Liga leaders Barcelona won a tight and tense 'Clasico' 1-0 at Real Madrid on Saturday, beating their great rivals at their Bernabeu home for the second time in four days and moving a staggering 12 points clear of them in the standings.
News of all that's transpired on and off the football field
Top seed Svetlana Kuznetsova was bundled out of the Indian Wells WTA tournament on Saturday, piling up unforced errors in a 6-4, 4-6, 6-1 loss to Spaniard Carla Suarez Navarro in the second round. Twice champion and former world number one Kim Clijsters of Belgium had a much easier time on a sunny afternoon in the California desert, cruising into the third round with a 6-2, 6-1 demolition of Czech Barbora Zahlavova Strycova.
The Frenchman, voted the world's third best player of 2016, has been the subject of intense transfer speculation since signing a new contract with Atletico in May 2017.
Goal-line technology was used for the first time in a World Cup match to decide if the ball had crossed the line during France's Group E clash with Honduras on Sunday.
Jaume Costa atoned for giving away a first-half penalty when his strike five minutes from time rescued Villarreal a 1-1 draw against Eibar that put them fourth in La Liga on Sunday.
News of all that's transpired on and off the football field
Toni Kroos netted his first for Real Madrid and was hailed as the best player on the pitch by his coach as the hosts tore apart Rayo Vallecano 5-1 in La Liga on Saturday to extend their winning streak to 13 games.
A summary of sports events and sports persons, who made news on Saturday
Real Madrid forward Cristiano Ronaldo faces a race against time to be fit for the Champions League semi-final second leg with Manchester City on May 4.
Andy Murray once again fills the prime time viewing slot on Centre Court late on Saturday, while five-time women's champion Venus Williams will have revenge on her mind against Carla Suarez Navarro.
Players from European champions Barcelona made up nearly half of UEFA's Team of the Year which was revealed on Friday, while Cristiano Ronaldo made the lineup for a record 10th time. Eight players from La Liga were included in the final XI, voted for by 7.2 million UEFA.com users from a 40-strong shortlist. Lionel Messi, Dani Alves, Gerard Pique, Andres Iniesta and Neymar were the Barcelona players included, while Real Madrid provided Ronaldo, Sergio Ramos and James Rodriguez.
Included in Barcelona squad to face Dortmund
This time we're ready for Barca, says Man City's Nasri.
Uruguay forward Edinson Cavani scored twice to earn the South Americans a 2-1 win over European champions Portugal in their World Cup round of 16 clash on Saturday and set up a quarter-final against France.
Barcelona are on the verge of completing a reported 30 million euro ($33.57 million) move for Spain international Paco Alcacer from Valencia after the striker arrived for a medical with the La Liga champions on Monday.
'Soul might not win trophies. But, unlike trophies, soul actually matters,' says Shougat Dasgupta.
World number four Jelena Jankovic beat Spain's Anabel Medina Garrigues 7-5, 6-2 to reach the final of the Andalucia Tennis Championships on Saturday. The Serbian second seed, by far the highest-ranked player remaining after Wednesday's shock exit of world number one Serena Williams, will be aiming to win her first title of the season when she meets Carla Suarez Navarro in Sunday's final.
Sania Mirza has received another lift in her already booming career. The Indian tennis ace reached the 25th doubles final of her career at the WTA New Haven Open.
Barcelona equalled a club record of 12 consecutive league wins as Neymar and Lionel Messi were among the scorers in a 6-0 thrashing of struggling Getafe 6-0 at the Nou Camp on Saturday.
Neymar should return to Spain with renewed enthusiasm after leading Brazil to their first soccer gold medal at an Olympic Games, Barcelona defender Gerard Pique said. Neymar, who has scored 85 goals in 141 games in his three seasons at Barcelona, was given permission to stay in Brazil until after international games early next month. "I think it's a good decision to grant him (Neymar) that," Pique told El Mundo Deportivo. "He has earned it.