Another impressive fightback moves Serena Williams into US Open semi-finals

Serena Williams beat Tsvetana Pironkova to reach the US Open semi-finals (Seth Wenig/AP)

Serena Williams stayed on course to match Margaret Court’s all-time record of 24 grand slam singles titles after stalling Tsvetana Pironkova’s remarkable comeback in the US Open quarter-finals.

Six-time champion Williams was forced to fight back from a set down for the third consecutive round before clinching a 4-6 6-3 6-2 success over the Bulgarian, who was playing in her first tournament for three years.