Alexander Zverev moved into the semi-finals of the Shanghai Masters with a 6-4 6-4 win over British No. 1 Kyle Edmund to cement his spot in the ATP Finals.
The German No. 5 has qualified for the second consecutive year after another solid season on the tour, while he also became the youngest semi-finalist in Shanghai.
He will face either Novak Djokovic or Kevin Anderson in the next round.
Djokovic, Roger Federer, Juan Martin del Potro and Rafael Nadal are the other players who have booked their place at the O2 in London, with Marin Cilic, Anderson and Dominic Thiem currently occupying the remaining spots.
Kei Nishikori and John Isner are leading the chasing pack but Edmund still holds realistic hopes of making the tournament as an alternate.
An alternate spot is an attractive proposition financially – paying £80,000 without hitting a ball – and the Yorkshireman could get some match time should one of the eight qualified players pull out.
Nadal withdrew last season as he ended his season with knee pain, while Del Potro suffered an injury during his third-round Shanghai clash with Borna Coric.
The Argentine is awaiting the results of tests after deciding to end the match after taking a heavy tumble on his knee.
During the match I had a bad fall. I made a weird movement with the knee and hit the floor very hard. I felt intense pain, the US Open finalist said.
After, I lost the stability and strength on my leg, so not to continue was the best decision. I didnt want any more risks after that.
The doctor observed me and told that we need to wait for the examinations results in a few hours. Then we will know how bad it was and how to proceed for the next tournaments.