Nicolas Colsaerts, Joost Luiten and Haydn Porteous shared a one-shot lead after a low-scoring first day of the Turkish Airlines Open.

Regnum Carya Golf & Spa Resort was playing host to the first of three consecutive Rolex Series events to finish the European Tour season with a seven million US dollar prize fund up for grabs in Turkey.

Glorious sunshine and calm winds greeted an elite field and it was Colsaerts, Luiten and Porteous who made the most of the conditions, firing seven under par rounds of 64 to lead the way from Padraig Harrington and Andres Romero.

Kiradech Aphibarnrat, Matthieu Pavon, Eddie Pepperell and Ian Poulter were then at five under with 41 members of the 78-strong field under par.

In the battle to be crowned Europe's number one, Race to Dubai Rankings presented by Rolex leader Tommy Fleetwood was level par, with third-placed Justin Rose at two under.

South African Porteous already has a win under his belt this season at the D+D REAL Czech Masters and produced a bogey-free effort with Dutchman Luiten repeating the trick and big-hitting Belgian Colsaerts dropping a single shot and making an eagle on the 12th.

Porteous was out in the first group off the 11th tee and set the early pace with birdies on the 11th, 12th, 13th, 15th and 17th.

The two-time European Tour winner was putting beautifully and needed to save par from around 12 feet on three occasions, also adding further birdies on the fifth and with an excellent tee-shot into the par three eighth.

Colsaerts was another early starter in the first group off the first and he made birdies on the fourth, seventh, eighth and ninth to turn in 30.

An eagle on the par five eighth saw him hit the front and he looked to pull away with gains on the 13th and 15th before a poor tee-shot on the next led to a dropped shot.

Luiten has been a picture of consistency this season but has just two top tens, with a second-placed finish last time out at the Andalucia Valderrama Masters hosted by the Sergio Garcia Foundation his best result of the campaign so far.

He birdied the first, fifth, seventh and ninth to turn in 30 and when he added back-to-back gains on the 12th and 13th he was right in the mix.

The 31 year old found himself over the back of the 16th green but took out the putter and rolled an effort up and over the ridge at pace and will have been relieved to see it hit the pin and drop in to put him in a share of the lead.

Argentinian Romero claimed his first European Tour win in ten years as a tournament invite in Germany and is clearly enjoying life back on Tour.

He birdied the fourth and bogeyed the sixth but then made three birdies in a row and added another on the 11th before eagling the 12th. He was in a share of the lead after a birdie on the 15th but then dropped a shot on the next.

Three-time Major Championship winner and tournament invite Harrington was bogey-free, with the Irishman making gains on the fourth, sixth, seventh, 11th, 12th and 14th.

England's Poulter was bogey-free in his 66, with countryman Pepperell, Thai Aphibarnrat and Frenchman Pavon all dropping a single shot.

Ireland's Paul Dunne, English duo Tyrrell Hatton and Lee Westwood and Dane Søren Kjeldsen were then at four under.