Jonas Gelzinis heads the title raceMichael Meadows, Dean Stoneman and Dan Lloyd lead the chaseVictor Jimenez tops strong Pro-Am1 packAfter six rounds of the Porsche Carrera Cup GB, 2013 is shaping up to be one of the most open and competitive of recent seasons as the action resumes at the fabulous Oulton Park circuit in Cheshire (8/9 June).After a five-week spring break following rounds five and six at Thruxton, four drivers have emerged as the major contenders for the overall title in the mighty 450bhp 911 GT3 Cup cars.Three drivers have taken wins across those six races, but as the championship moves north, it is the consistent Jonas Gelzinis (Juta Racing) who holds a single-point lead over defending champion Michael Meadows (Samsung Smart Motorsport). Meadows has had a mixed start to his season, with a couple of clashes denting his early points scoring. However resounding wins at Donington (twice) and Thruxton show why he remains the favourite for the title.Gelzinis, however, has been strong everywhere and heads to Oulton Park on top. The Lithuanian racer relishes the challenge of Oulton and will be determined to add his name to the list of 2013 race winners.The driver who dominated the opening weekend of the season at Brands Hatch was Dean Stoneman (Redline Racing), but after that rocket start to his Carrera Cup career Dean has had a couple of mixed weekends. He will want to start the middle section of the season with the sort of form that put him straight to the top of the points at Brands.Carrera Cup Scholarship racer Dan Lloyd (Team Parker Racing) scored a mighty victory at Thruxton to bounce back from two troubled weekends and has the pace to win again as he chips away at the points gap to the top three. Meanwhile, Rory Butcher (Celtic Speed) is the fifth of the potential race winners and deserves a change in fortune after an up and down season to date.In Pro-Am1, Spanish racer Victor Jimenez (Redline Racing) has established a handy early lead but his team mate Dan De Zille in particular is chasing hard after switching to Pro-Am1 before round three at Donington Park. However, back on the grid for Oulton Park and sure to make a big impact on the category are Irish brothers Michael and Karl Leonard with Team Parker Racing. Both are potential Pro-Am1 winners and Karl in particular is recognised as a real ace at the Cheshire track. Giving Pro-Am1 its best entry of the season to date should be Keith Webster (Redline Racing) who returns after missing the opening races due to a broken arm.In Pro-Am2, the battle will be between Peter Smallwood (Parr Motorsport) and Will Goff (Goff Racing) as they both return to the championship after missing the Thruxton races.After qualifying on Saturday (8 June) at 12.05, round seven of the Carrera Cup GB will start at 17.05. Round eight will start at 15.55 on Sunday (9 June) and will be broadcast live on ITV4.