Muguruza keen to press on after seeing off Ostapenko

Garbine Muguruza made a winning start to her third consecutive appearance at the WTA Finals with a 6-3 6-4 victory over Jelena Ostapenko on Sunday but the Spaniard will continue to push herself through the group stage knowing anything can happen.

At her first appearance in Singapore, the world number two won all three round-robin matches before losing a tight semi-final to an inspired Agnieszka Radwanska, while last year she was eliminated early after losing two of her three ties.

On both occasions, the eventual champion (Radwanska in 2015 and Dominika Cibulkova last year) sneaked into the knockout stage with losing 1-2 records in pool play.

"Well, I think it's very important to start with a win," the Wimbledon champion told reporters.

"What I learned from the past is that every game counts, every set, because at the end only two (players per group) are going to pass. And previous winners had lost twice and they have won, which is incredible," she added.

"I take it as a final, honestly, every point, every game, every set."

Del Potro Surges Into London Contention, Mover Of The Week

No. 14 Juan Martin del Potro, +4

A convincing straight-sets triumph over top seed Grigor Dimitrov in the final of the Intrum Stockholm Openlifted Juan Martin del Potro into contention for a return to the Nitto ATP Finals, to be held 12-19 November at The O2 in London. Del Potro secured his 20th ATP World Tour title and jumped four spots to No. 14 in the Emirates ATP Race to London by retaining his Stockholm crown. Read Report.

The Argentine has 2,135 points in the Race, 470 points behind eight-placed Spaniard Pablo Carreno Busta. The 29-year-old is looking to secure his first Nitto ATP Finals berth since 2013 as one of the top eight players to qualify for the season finale. He is fourth seed at the Swiss Indoors Basel this week.

No. 5 Grigor Dimitrov, +1

The Bulgarian, who is next in line to qualify for the Nitto ATP Finals, improved his chances with a run to his third Stockholm final. It was his first defeat in four ATP World Tour finals this season.

The 26 year old rose one spot above Marin Cilic to No. in the Emirates ATP Race To London with 3,560 points, just 25 points ahead of the Croatian. He could seal his debut berth at the Nitto ATP Finals this week when he the Erste Bank Open 500 in Vienna.

Federer's Homecoming; Race To London Heats Up In Basel, Vienna

It will be a sprint to the end of the 2017 Emirates ATP Race To London. Two weeks remain in the Race, and half of the Nitto ATP Finals qualification spots are still available.

Rafael Nadal, Roger Federer, Alexander Zverev and Dominic Thiem have already qualified for the prestigious event, to be held 12-19 November at The O2 in London.

But four other places remain, with Grigor Dimitrov, Pablo Carreno Busta, Sam Querrey and Kevin Anderson looking to boost their chances at the Erste Bank Open 500 in Vienna. Marin Cilic, David Goffinand Juan Martin del Potro will hope to do the same at the Swiss Indoors Basel.

Dimitrov might not have to wait until the new tournaments start on Monday; he could clinch his London debut on Sunday. The Bulgarian faces del Potro in the Intrum Stockholm Open final. With his second Stockholm title, the 26-year-old Dimitrov will book his place in London.