Former Indian tennis player Prakash Amritraj wonders what could have been had Juan Martin del Potro stayed healthy. Del Potro, 33, was tipped to win multiple Grand Slams and become world No. 1 after his 2009 US Open victory. Unfortunately, what followed were years marked with injuries and long injury breaks. “[Juan Martin Del Potro’s impending retirement] has got us all thinking about his entire career and reflecting over all of it.The giant ‘What if?’ of Juan Martin. Instead of the Big-4, it’s likely to have been the Big-5,” Amritraj said on Tenis Channel, according to Sportskeeda. Amritraj enjoyed watching del Potro at the Rio Olympics Del Potro delivered a huge performance in the Rio Olympics first round to send world No.1 Novak Djokovic packing out of Rio de Janeiro. Del Potro ended up winning the silver medal as he was beaten b …