BARCELONA, June 14 : Formula One leader Kimi Antonelli said he was left with an empty feeling after his five-race winning streak came to an end at the Barcelona-Catalunya Grand Prix on Sunday. The 19-year-old Italian, the sport's youngest ever championship leader, retired four laps from the finish after his Mercedes suffered an electrical shutdown while in second place. The failure allowed Ferrari's Lewis Hamilton, the race winner, to slash Antonelli's lead from 66 to 41 points after seven of