Who bowled underarm in a One Day International

Trevor Chappell
Chappell became infamous after bowling an underarm delivery when playing for Australia during a match against New Zealand in 1981.

The teams were contesting the third final of the Benson and Hedges World Series Cup. https://www.youtube.com/watch?v=uDuMudvbuqI New Zealand needed to score six runs to tie the match.

Not wanting to risk this, Greg Chappell, Australia's captain and Chappell's brother, asked Trevor Chappell how his underarm bowling was.

When Trevor Chappell replied that he didn't know because he had never bowled underarm, Greg Chappell said, "well there is only one way to find out" and then Trevor Chappell rolled the ball along the ground to batsman Brian McKechnie.

Read more...https://en.wikipedia.org/wiki/Trevor_Chappell#Underarm_incident