London: Little known Australian player Sam Groth has fired down the fastest recorded serve in professional tennis, a 263 kmph rocket in a Challenger event in South Korea. The ATP Tour said on Saturday that Groth, ranked 340 in the world, produced the serve in a second-round match against Belarusian Uladzimir Ignatik in Busan. Groth's effort beat the previous fastest recorded serve of 251 kmph sent down by Croatian Ivo...