The Boston Celtics edged the Los Angeles Lakers 125-121 in an overtime battle tinged by controversy on Saturday as Philadelphia 76ers big-man Joel Embiid out-dueled Denver's Nikola Jokic as NBA rivalries took center stage.Irving posted his sixth straight game of 30 or more points. - 76ers rally - Things were perhaps more personal in Philadelphia, but Embiid, who finished runner-up to Jokic in voting for Most Valuable Player honors the past two seasons, insisted there was no "rivalry" between him