Shane Byrne says he is leaving Donington Park quietly confident about his chances of retaining his MCE British Superbike crown after claiming first and second place finishes at round one of the 2015 campaign.

The PBM Kawasaki rider had initially been a doubt to even race at the BSB season opener after breaking his hand during pre-season testing in Spain. However, a second place in race one followed by a fantastic victory in race two - his 62nd career BSB win - sees the four-time champion on top of the riders' standings.

"To come here was one thing but to grab a win was another," Byrne said. "It leaves me quietly confident because I know my fitness will come back and I know the bike is going to improve."

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The defending BSB champion says he's been struggling to find consistency on the 2015 version of his PBM Kawasaki ZX-10R and in the free practice sessions says he could only run four and five lap stints. On top of his own fitness concerns, Byrne feels he still has a lot of areas to improve on before he'll be happy.

"We are not where we need to be," Byrne said. "It's not been easy. The reality is it is the same team and the same bike but in truth it feels a completely different bike. Every little reference point that we had on the old bike doesn't seem to want to work on this bike.

"The team has been chipping away, fixing things but then something else would go wrong so we'd have to fix that. But looking at the bigger picture I only got my hand out of the cast on Thursday so it has been a fantastic weekend."

The highly-experienced Byrne is also adamant not to get too carried away and anticipates his rivals to close the gap over the course of the year.

"It's way too early to say where we will be at the end of the season," Byrne explained. "The one thing in racing is expect the unexpected. I certainly didn't envisage the races I've had and I certainly didn't expect to see how different the two races were. But that is racing and you can't predict anything.

"Nothing can be won until the last three rounds so what we've done today hasn't made a great bit of difference expect for the useful podium points."