Rafael Nadal is hopeful he can be ready in time to take part in the ATP Finals.
Nadal was forced to pull out of the Paris Masters semi-finals last week after feeling pain in his stomach.
The Spaniard took the precaution, citing a similar injury from the 2009 US Open as the reason he didn’t want to take the risk.
It meant Nadal faced a race against time to prove his fitness for the season-ending ATP Finals.
However, the 34-year-old is hopeful of taking part in the tournament.
“Ok, I’m in London happy to be here,” he tweeted.
“Taking it day by day after Paris (small abdominal tear).
“I need to see how things go, started serving yesterday very slowly.
“Right now the main goal is to be ready on Monday following the protocols that the doctor gave me.”
Nadal was drawn in the Andre Agassi group, meaning he will face Daniil Medvedev, Stefanos Tsitsipas and Alexander Zverev.
Part of his desire to play at the ATP Finals could also come down to the fact he can clinch the year-end world No 1.
He overtook Novak Djokovic at the top of the men’s rankings at the start of the week, despite the Serbian winning in Paris.
There are still some scenarios which could see Djokovic reclaim his No 1 spot, despite being behind by 640 points.
If Nadal doesn’t play in the ATP Finals, Djokovic will then only need to reach the final.
But if the 19-time Grand Slam champion does play and wins two round-robin matches, Djokovic must then win the tournament for the first time since 2015.
There will be nothing Djokovic can do though if Nadal reaches the final of the ATP Finals.