Crans-Montana - Miguel Angel Jimenez fired a six-under round of 64 to be in a three-way tie for the lead after the European Masters first round on Thursday.
Jimenez, 53, had seven birdies and a single bogey on the picturesque Swiss Alps course to share the top of the leaderboard with 30th-ranked Tyrrell Hatton of England and Scott Hend of Australia.
Jimenez also competes on the senior tour and already holds the European Tour record as the oldest winner.
At 50, his 2014 Spanish Open title was his 21st on the tour.
Six players were one shot behind the leaders, including Thongchai Jaidee of Thailand and South Africa's Darren Fichardt. The European Masters is also an Asian Tour event.
Among five players on four-under was American golfer Daniel Im, who aced the 175-yard (160m) eighth hole with a seven iron.
Two-time European Masters champion Alex Noren of Sweden opened his title defence with a level-par round.
In his 500th start on the European Tour, Lee Westwood of England carded a one-over 71.