I always remember in 2002 at the Tennis Masters Cup, there were two Spaniards in Group A - Carloa Moya and Albert Costa. They faced each other for the final RR match of their group. At that point Moya had two straight sets wins and Costa had one three set win. Elsewhere in the group, Hewitt had one loss and a couple of three set wins. Moya was already in the semis. Everybody realised that if Moya let his Spanish buddy Costa beat him in straight sets, then Costa would go through and Lleyton - who wasn't particularly liked by the players - would be eliminated. As it turned out the spaniards played fair and Moya won the match. Here in the final Group A match in 2009, Federer and DelPo also have the chance to make sure they both go through. If DelPo wins in three sets making sure that they both have a high number of games, then they could assure each other safe passage into the semis. Now of course this would never happen, but interesting that it is possible at all.