Tokyo champion Alexander Zverev is the last German in the Paris Olympic tennis tournament after he eased through to the quarter-finals following an early wobble on Wednesday. The 27-year-old defeated Australian Alexei Popyrin 7-5, 6-3 and will next meet Italian Lorenzo Musetti on Thursday. Serbian great Novak Djokovic could be waiting in the semi-finals and Carlos Alcaraz, who beat him at the same Roland Garros venue in the French Open final in June, in the gold medal match if he can get there. Under a closed roof, the German number one lost his service game at 1-2 and at 4-5 was facing a firs…