Troicki said he was exhausted after playing eight sets in three matches across two days .
Troicki hit a career - high ranking of No. 12 almost five years ago but has never gone reached the final - 16 of a grand slam .
Troicki , who hit a career - high ranking of No. 12 almost five years ago but has never gone reached the final - 16 of a grand slam , said he was exhausted after playing eight sets in three matches across two days .