Knock him down and one thing is certain about Tomas Berdych at the ATP World Tour Finals — he will bounce right up again. The 29-year-old Czech has qualified for the year-ending showpiece beside the River Thames five years in succession and each time he has lost his opening match.

On Monday he crashed 6-1 6-1 to Swiss Stanislas Wawrinka but, true to form, he rebounded to win his second group match at the 02 Arena on Wednesday, outclassing Marin Cilic 6-3 6-1.

Just as his opening match record is lamentable, albeit his tormentors have been Rafa Nadal, Novak Djokovic, Andy Murray and Wawrinka twice, his second match record now reads 5-0. So what transformed the world number seven from a pussycat to a tiger in the space of two days?

“I think that’s the beauty of this event,” he told reporters after keeping alive his hopes of claiming a semi-final spot with a top-two finish in Group A.

“One day you can be swept out from the court like I was and in two days’ time you can come up and play different tennis.

“Basically there were no miracles in that time in between the matches. I just had a good practice session yesterday, good rest, refocused again, and ready to go for another match.”

Berdych was certainly a far different proposition to the one that was thumped by Wawrinka. He broke Cilic’s serve in the first game of the match and, after saving two break points at 4-3, never looked back.

Berdych said he faced “mission impossible” after his opening loss and while he is at least still in the mix, the odds are stacked against him with Djokovic his third opponent.

The last time they played, in the Beijing final a few weeks ago, Berdych managed two games. “I’m going to try to maybe win three, four games. That would be better from the last time,” he joked. “As I said after my first match, it couldn’t be worse than that. So let’s see. It’s pretty much the same scenario for that. It couldn’t be much worse.

“It’s always a huge challenge to play the number one player in the world. The way he’s playing, where we are playing, it’s pretty much all set up for him and for his game. But I’m going to bring all that is left in me.”

Murray’s conundrum

Andy Murray could beat Roger Federer on Thursday and crash out of the ATP World Tour Finals or lose and go through to the semi-finals — such is the conundrum he faces. However, the 27-year-old is glad just to still be in contention after Tuesday’s 6-3 7-5 defeat of big-serving Canadian Milos Raonic.

That victory means all scenarios are possible going into the final round-robin matches.

“For me it depends on the winner of the Nishikori/Raonic match. If Kei wins, then I need to beat Roger, it depends on the scoreline of that match with Kei and Raonic. If Raonic wins, then I know that all I need to do is win the match against Roger and I’ll be through.”

Should Murray and Nishikori both win in straight sets the calculators would have to come out to decide who goes through.