By Andrew Benson
Jenson Button is poised to break his duck and win his first Grand Prix this year, David Coulthard has told the BBC.
Coulthard says Button is as good as anyone in F1
Button has driven 102 Formula One races without winning but Coulthard said he expected that run to end this season, which starts in Bahrain on Sunday.
Coulthard said: "He's good enough to win. He's fired up. He looks fit. The Honda seems quick, so I wouldn't be surprised if he's challenging for wins.
Renault design boss Pat Symonds said he was also "convinced" Button would win.
"He's got the car to do it and the ability to do it," said Symonds. "I'm convinced he's going to win races this year; I'm just not quite so convinced about the championship.
"I don't mean that as any sleight against him. I think he and the team can do it, but I'm not sure they will - it's going to be very close this year."
But Symonds - who has worked with world champion Fernando Alonso, Michael Schumacher and Button - added that Button was not among the very best drivers in F1.
"There are divisions within the drivers," Symonds said, "and I do think Michael, Fernando and Kimi [Raikkonen of McLaren] are in a division of their own, and in that division I wouldn't really like to rank them.
"Jenson is outside the top three, but he's probably inside the top six. But I wouldn't like to be more specific than that."
That belief is widespread among F1 insiders - but Coulthard said it was mistaken.