Argentine tennis star Juan Martin del Potro may have won titles in Acapulco and Indian Wells and reached the Miami Open semi-finals this year, but on the personal front, he had a tough time coming to terms with the loss of his pet dog Cesar, who passed away in February.

Del Potro posted the above picture on Instagram with his pet and wrote, "I'm going to miss you a lot, faithful companion. You accompanied me in these almost 10 years, you waited for me with joy after each trip, you protected me, you made a whole family happy and today you go to rest in peace leaving your mark in my heart. Goodbye, Cesar."