The ATP Board also approved a trial elimination of the service let on the ATP Challenger Tour only, for the first three months of 2013.
“Although this change will not materially reduce the length of a match, we believe it should have a positive impact on the flow of the match,” said Drewett. “We’re certainly not ready yet to eliminate the service let, but believe a trial at the ATP Challenger level will be a good way to test this initiative in a competitive environment and get feedback from players and the public before deciding if it could be adapted more broadly.”
http://m.atpworldtour.com/News/Tennis/2 ... nalty.aspx
I'm told this is the rule at the collegiate level as well. My instinct, though, is why change such an established rule for little added value.... Thoughts?