For just the third time this season, the Swiss stars Roger Federer and Stan Wawrinka will cross paths on the professional tour, this time to determine who will advance to the final of the Barclays ATP World Tour Finals. Federer leads the overall head to head series 14-2.

Although this year’s championships has clearly not been the most competitive of tournaments, few anticipated that Roger Federer would trample over British No. 1 Andy Murray en route to the knockout stage of the prestigious event, particularly on Murray’s home soil. Federer maintained his perfect record this year at the O2 Arena with a 6-0, 6-1 beatdown of Murray in a “uncomfortable” contest that lasted a mere 56 minutes. Remarkably, it was also Federer’s 250th indoor victory and sent him into the semi-finals with a 3-0 record.

“I had the upper hand from the baseline, which hasn’t always happened against him,” said Federer. “But I definitely was able to play on my terms. For me, things went very well. I was able to put Andy under pressure very often, and I think the match couldn’t have gone any better for me really.”

In arguably the most competitive match of the tournament yet, Stan Wawrinka edged out Marin Cilic 6-3, 4-6, 6-3 to reach the semi-final round of the year-end championships. The Swiss No. 2 cruised through the opening set 6-3 in 32 minutes, mainly controlling the match with his dominance at the net. However, things began to get rocky in the second set and boiled over when Stan found himself down a break in the deciding set early on.

Ultimately, though, Wawrinka began to mix up his shots and decrease the unforced errors, and then broke to close out the match and set up a Saturday showdown with Federer.

This marks the 17th time that these two countrymen will meet on the professional tour, with this encounter taking place less than a week before they are scheduled to lead Switzerland in the Davis Cup final. Federer leads the series 14-2, but the pair have split their two previous matches in 2014. Based solely off their performances this week in London, Federer should have no trouble reaching the final.

Prediction: Roger Federer in Straight Sets