Andy Murray says he was turned down by a "lot of coaches" before reuniting for a third spell with Ivan Lendl in March.
The partnership previously yielded all of Murray's major wins - two Wimbledon titles, a US Open and two Olympic golds - before his long-running hip issues.
The Scot, 35, is "grateful" Lendl still believes in him and is optimistic of being fit for his Wimbledon opener on Monday after an abdominal strain.
"Obviously having Ivan in my team helps," said Murray.
"We've had a lot of success in the past, we know each other well and he still believes in me.