Novak Djokovic has already contested two thrillers against Stanislas Wawrinka this year and they are seeded to meet again in the China Open quarter-finals this week.
Djokovic got the better of Wawrinka over five sets at the Australian Open in January and he was once again pushed to the limit by the Swiss in the US Open semi-finals a few weeks ago, coming from two sets to one down to edge through in five.
Twelve months ago, the Serb enjoyed a fairly comfortable ride to the China Open title, dropping just a single set along the way but he can expect a far tougher route this time round. Wawrinka will relish another chance to take down the world number one in the last eight although he suffered a disappointing semi-final defeat at the Malaysian Open.
In the last four, Djokovic could come up against either David Ferrer or Richard Gasquet. Ferrer has been struggling of late and lost to world number 77 Joao Sousa in the Kuala Lumpur quarter-finals while Gasquet is in the form of his life, making his second career Grand Slam semi-final at the US Open.
In the opposite half of the draw, Rafael Nadal has been drawn back to Beijing once again, the site of his thrilling triumph at the 2008 Olympics, one of the most memorable moments of his career.
Competing for the first time since helping Spain back into the Davis Cup World Group a fortnight ago, Nadal will start against a qualifier with a potential quarter-final clash with Tommy Haas in the mix.
Nadal is seeded to face Tomas Berdych in the last four although that will not concern him greatly as the Czech has not beaten him since 2006.