Yahoo Sports reports: Serena Williams is back. Teaming up with rising Canadian teenager Victoria Mboko for a straight-sets win over the No. 3 seeds in women’s doubles at the Queen’s grass-court tournament in London, Williams sent a message to the tennis world that it may be in for an interesting summer. Williams’ comeback comes just under one year after she decided she had something else to tell the world. Last summer, the 23-time Grand Slam singles champion said she had been taking Zepbound, one of the new generatio