Tennis is a game of minute percentages. The margin of error is minimal and things unfold at a rapid pace. One or two points here and there can open any contest wide open and some shots, rallies or even a mini-break helps a player to revamp and gain some momentum.

Relive nerve-wracking tennis rallies featuring big guns Novak Djokovic, Rafael Nadal and more - Watch

Grigor Dimitrov rallied for a shocking upset of 20-time Grand Slam champion Roger Federer at the US Open on Tuesday, the lowest-ranked New York semi-finalist in 28 years advancing to face Daniil Medvedev.

Grigor Dimitrov stuns Roger Federer to reach US Open semi-finals

Grigor Dimitrov advanced into the second round of the China Open after defeated Tennys Sandgren 7-5, 6-3 on Tuesday. Dimitrov took almost an hour and a half to beat Sandgren who was playing as a late replacement for compatriot Ryan Harrison, who had to pull out prior to the match with a back injury.

China Open: Dimitrov beats Sandgren to enter 2nd round

Dimitrov overcame David Goffin in the quarter-finals to enter the semis of the Monte Carlo Masters.

Dimitrov enters semi-finals after defeating Goffin

Elina Svitolina will face Denisa Allertova to pursue her dreams of the maiden slam

Day 7: Nadal, Dimitrov, Kyrgios, Wozniacki eye quarter-finals

The victory saw Dimitrov move up by three places to stand only behind Spain's Rafael Nadal and Swiss star Roger Federer

Dimitrov surges to career-best third spot after ATP Finals triumph

France?s 11th seeded Lucas Pouille was the other big casualty after he lost to Donald Young

Miami Masters: Nadal, Nishikori through to next round; Dimitrov loses

Nadal pulled off one of his greatest victories in denying Dimitrov, 6-3, 5-7, 7-6 (7/5), 6-7 (4/7), 6-4 in four hours and 56 minutes

Australian Open: Nadal beats Dimitrov to face Federer in finals

Nadal beat an injured Milos Raonic while the 15th-seed Bulgarian beat David Goffin

Australian Open: Nadal, Dimitrov set up semi-final clash

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