Stan Wawrinka's win over Juan Martin del Potro was a welcome result for us after what's been frustrating couple of rounds. With a bit of luck, this could have been a seriously good tournament. Instead we're looking at just about making a profit.

Onto the semi-finals and I'm still getting over Andy Murray's defeat to Kei Nishikori who extended his record against Top 10 players at Flushing Meadows to 5-0. He beat Wawrinka on his way to the final two years ago but I think the Swiss is worth a bet at odds-against. Nishikori had a hard match against Murray and his body might just let him down again. If Wawrinka is on his game, this might be over reasonably quickly so I'm also backing him -1.5 sets.

Gael Monfils has done us proud by winning his quarter and landing us a nice 6-1 bet at the start. But it would take something special for him to beat Novak Djokovic who had another short match when Jo-Wilfried Tsonga pulled out injured. While La Monf has looked a more solid player this fortnight, it's still hard to see him getting much out of this match and the odds reflect this.

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Stan Wawrinka to beat Kei Nishikori - 3pt @ 5/4
Wawrinka -1.5 sets v Nishikori - 2pt @ 2/1

Serena Williams had to dig deep against Simona Halep, dropping her first set of the tournament to reach the semis. It shows she is beatable and a quick turnaround makes her vulnerable, in my opinion. Karolina Pliskova cruised past Ana Konjuh and there will be no pressure on her in her first Slam semi-final. The Czech hits the ball as hard as anyone and Williams' best tactic would be to move her around the court, something the 34-year-old may not be able to do as effectively 24 hours after a tough match. If Pliskova can stay with the world number one early on, she might just win this.

Angelique Kerber faces Caroline Wozniacki who had something close to a walkover in the previous round against Anastasija Sevastova. Kerber had to come through a tight first set against Roberta Vinci before racing through the second and she has already shown mental strength this tournament to go with her ability on the court. The German is the only player not to drop a set this fortnight and I think odds-against about her keeping that going is more than fair. The only way Wozniacki makes a match of this is for Kerber to make plenty of unforced errors and I just can't see that happening.

Karolina Pliskova to beat Serena Williams - 2pt @ 9/2
Angelique Kerber to beat Caroline Wozniacki 2-0 - 4pt @ 6/5