who became the fastest man worldwide after running a distance of 100m in just 9 point 58 sec in 2009
100 metres The 10-second barrier has historically been a barometer of fast men's performances, while the best female sprinters take eleven seconds or less to complete the race. The current men's world record is 9.58 seconds, set by Jamaica's Usain Bolt in 2009, while the women's world record of 10.49 seconds set by American Florence Griffith-Joyner in 1988 remains unbroken.
Fastest recorded tennis serves The Association of Tennis Professionals (ATP) does not formally recognize service speed records made in Challenger tour events due to lack of uniformity in these tournaments' radar guns (including availability or lack thereof). Nevertheless, the serve speed of 263.4 km/h (163.7 mph) recorded by Australian Sam Groth at an ATP Challenger event in Busan, South Korea in May 2012 was measured using approved equipment according to the ATP, and other data gathered appeared within a normal range. However, John Isner holds the ATP's official record for the fastest serve at 253 km/h (157.2 mph).[2]