Serena Williams' coach Patrick Mouratoglu has backed Emma Raducanu to win more Grand Slam titles, but says fans will have to be patient first.
Raducanu shot to global superstardom after winning the US Open in October, and in doing so becoming the only qualifier in history to win a Grand Slam.
However, the 19-year-old has struggled since and has been failed to make it past the first round at the Australian Open and Indian Wells this season.
Mouratoglu is more qualified than most to comment having guided Serena Williams to multiple majors, and he has overseen the development of ATP world number five Stefanos Tsitsipas too.
He says he still sees a huge future for Raducanu despite her recent struggles but has warned she must be given time to develop the consistency required to fulfil her obvious potential.
"She has a very good game and she's a great athlete. She showed some incredible mental strength because what she did at the US Open is something special," Mouratoglu said of Raducanu.
"It is always special to win a Grand Slam, but the way she did it was really special. On the other hand, it happened so fast, like if you ask her 'how did you do it?' I'm sure she can't answer that," he claimed.
"I feel like she's going through a really tough time but the way she handles it is great. She doesn't show any weaknesses.
"She's fighting and doing her best every day and she's probably thinking 'step-by-step I'm going to build my tennis to be consistently playing at that level.'
"I think she's on the right track. She has a good team and you can see she's putting in the work.
"You guys will have to be very patient with her because if she's exposed to too much pressure, it's going to hurt her and that might impact her career.
"I think she can win more Grand Slams but it's very early to win some others for her because she played without any pressure and suddenly all the pressure came so she's not the same player as she was months before the US Open.
"When you're under pressure your weaknesses show so she's not ready for that now, that's what I think. Will she be in the future? I think so.
"If she's able the maintain the mindset she has at the moment with the work she's putting in, I think she has the game, the physical ability and the mental strength to do it in the future."