LONDON -- Five things to watch at Wimbledon on Monday, Day 1 of the grass-court Grand Slam tennis tournament:1. FEDERER, MURRAY, NADAL GET STARTED: Three of the men who comprise what's often referred to as tennis' Big Four are scheduled to play Monday. Seven-time Wimbledon champion Roger Federer, who won the 2012 title, is up against Romania's Victor Hanescu in the first match of the year on Centre Court. Andy Murray, last year's runner-up, renews his bid to give Britain its first male champion in 77 years by taking on Germany's Benjamin Becker (best known, if at all, for beating Andre Agassi in the American's last professional match, at the 2006 U.S. Open). And Rafael Nadal, twice the champion at Wimbledon, plays his first match at the All England Club since last year's surprising second-round loss, facing Belgium's Steve Darcis. The No. 2-seeded Murray, No. 3 Federer and No. 5 Nadal all wound up on the same half of the draw, which is why they all start on the same day, prompting this wisecrack from No. 1 Novak Djokovic, safely ensconced on the other half: "Well, I think it's going to be a great Monday for tennis."