In Indian Wells as an 18-year-old in March 2016, Alexander Zverev had a straightforward forehand volley to knock out Rafael Nadal and take his place in the quarter-finals.
He buried it in the net, and the chance was gone. "On match point, I sucked," the German later said.
That was their first meeting. Four subsequent matches have also gone Nadal's way, but there were five sets in the 2017 Australian Open, and a narrow escape for the Spaniard in Sunday's Rome Masters final.
Nadal may well have recovered from 3-1 down in the deciding set without the rain delay, but it certainly checked Zverev's momentum and ended his run of 13 wins in a row.