Here I am not rating the 5 best fast bowlers ever overall in order of merit,.My criteria is how they ranked at their best in a single spell. 1.Curtly Ambrose Unimaginable intensity and hostility.Reminiscent of a cowboy mowing down his opponents or an army competing a combing operation.Who could surpass Ambrose at Perth when taking 7-22in 1992-93 or at Trinidad when taking 6-24. Curtly would make the ball rise so rearingly from a good length that opponents would be dumbfounded.Bounce was literally vertical.No bowler was better in ressurecting a team from the grave when defending a low score. 2.Wasim Akram Equivalent of Rembrandt or Beethoven to pace bowling with artistry of magical or mythical proportions.His reverse swing was unreadable leaving batsman perplexed.Best ever on docile surfaces.Difficult to visualize any better delivery than his dismissal of Rahul Dravid at Madras in 1999. 3.Malcolm Marshall The ultimate master of bio-mechanics who created virtually unplayable banana swing and skidding bounce.Lethal even on a spinners track like in Sydney in 1984-85.In England in 1988 arguably bowled better tan any paceman ever where at fast-medium he rattled the batsman. 4.Michael Holding Resembled an antelope with astonishing speed through the air and the most fluent action ever.Has to his credit the bets over in test cricket bowling to Boycott in 1981 at Bridgetown and the best bowling spell ever when taking 14-149 at the Oval in 1976.He would bounce the ball very near the bat and could move the ball either way. 5.Imran Khan Determination and agression personified.At his fastest matched strides with Jeff Thomson,combining prodigious swing.His spells versus India in 1982-83 at Karachi and Hyderabad where he captured 5 wickets apiece in around 25 balls revealed pace bowling skill in regions rarely traversed.Arguably till then no paceman ever combine sustained pace with such movement.