INDIANAPOLIS — Neither of Boston’s All-Star wings, 6-foot-6 Jaylen Brown nor 6-foot-8 Jayston Tatum, could stop T.J. McConnell on Saturday night. The Pacers’ pesky reserve point guard dribbled along the baseline of Game 3’s second quarter against the Celtics, sneaking around Brown and then drawing Tatum, before faking the first-team All-NBA selection out of his shoes. McConnell buried that midrange jumper en route to an energizing 23 points, 9 rebounds and 6 assists during Indiana’s 114-111 loss that gave Boston a commanding 3-0 series lead.