Olympic champion Alexander Zverev and Australian Open finalist Daniil Medvedev will join Spanish superstar Carlos Alcaraz on captain Bjorn Borg’s Team Europe at this year’s Laver Cup in Berlin from September 20-22, organizers said on Thursday. Borg has vowed to take back the trophy from defending champions Team World, captained by his long-time rival, John McEnroe. “Team Europe is super motivated to win back the Cup in Berlin. I think we have an excellent chance of making that happen,” Borg said. Both Medvedev and Zverev are Laver Cup champions, while Alcaraz will be making his debut in Berlin…