Westwood said he felt sore during the first round
-8 RJ Derksen (Ned) -5 A Canizares (Spa), M Kaymer (Ger), J Van de Velde (Fra) -4 D Lee (NZ), S Strange (Aus), M Siem (Ger), R Rock (Eng), J Randhawa (Ind) Selected others: -3 O Wilson (Eng), P Broadhurst (Eng), R McIlroy (NI) -2 A Scott (Aus) -1 L Westwood (Eng), L Donald (Eng), G Storm (Eng), C Wood (Eng) Par R Fisher (Eng), A Cabrera (Arg) +1 I Poulter (Eng), A Cabrera (Arg) +2 C Montgomerie (Sco)
Lee Westwood shook off a calf problem to shoot a one-under-par 70 in the first round of the French Open.
The 37-year-old missed Wednesday's pro-am suffering from swelling in his calf but was deemed fit for the tournament.
The world number three is seven off the lead held by Dutchman Robert-Jan Derksen, who shot a brilliant 63.
Ryder Cup contender Martin Kaymer is three adrift, while Northern Ireland's Rory McIlroy and England's Oliver Wilson are both on three under.
It was first feared that Worksop's Westwood, who was last year's runner-up following a play-off, was suffering from a blood clot but it was later revealed that the swelling in his calf was probably caused by the heat.
"It's a bit sore and stiff and I think I have an injury in there somewhere," he said.
"I think it wants rest and I have a couple of weeks after the Open when I can put my feet up."
World number eight Ian Poulter went round in 72 and was also relieved to be playing in Paris having suffered a reaction to an insect bite on his shin which also forced him to miss the pro-am event.
After three-putting the 16th and 18th he said: "I got round all right, but it's been itching the whole day and driving me crazy."
Frenchman Jean van de Velde, infamous for surrendering a three-shot lead following a triple-bogey at the last at the Open in Carnoustie in 1999, is alongside Kaymer and Spaniard Alejandro Canizares on five under.
If the current world number 1,175, who is not a European Tour card holder, wins the event then the 44-year-old will qualify for this year's Open at St Andrews, which starts on 15 July.
"I have no expectations whatsoever - even now, especially now," said Van de Velde, who received a sponsor's invitation to be part of the field.
"But we will see - you never know with a Frenchman."
World number seven Luke Donald finished on one under , while playing partner and world number 10 McIlroy came home in 33 for his 68.
Ryder Cup captain Colin Montgomerie recorded a 73 in his first round and two-time Masters champion Jose Maria Olazabal finished on 11 over in his first tournament since October, following an ongoing battle with rheumatic shoulder pain.