The Swiss Open website has a really cool 2000fps camera capture of a shuttle/racket impact. check it out http://www.swissopen.com/english/e_html/e_turnierinfos/e_speedcourt.html . 305km/h is 190mph!! Tennis doesn't even come close and it also edges out Jai Alai's record of 188mph.
It is fast, yes, but it it doesn't retain its speed as long as Tennis and Jai Alai. Blame it all on the shuttle, if the feathers were off then they'd be really flying.