Yahoo Sports reports: Serena Williams revealed even 23-time grand slam singles champions are not immune to butterflies after confessing the nerves kicked in half an hour before her hotly-anticipated comeback victory at the Queen’s Club in London. The 44-year-old American and her 19-year-old Canadian doubles partner Victoria Mboko secured a 7-6 (7-2), 6-2 first-round win over third seeds Nicole Melichar-Martinez and Erin Routliffe at the HSBC Championships to mark her first competitive tennis in 1,376 days.