By Pritha Sarkar LONDON (Reuters) – Since welcoming home a British male grand slam champion is as rare as a sighting of Halley's Comet, it was little wonder Andy Murray got a standing ovation just for walking on to Wimbledon's Center Court on Monday. The man who ended 76 years of British hurt by lifting the U.S. Open trophy last September did not disappoint on his homecoming as he began his bid to win the most famous prize in tennis with a 6-4 6-3 6-2 win over German Benjamin Becker. …