Tom Sykes has moved up to sixth in the overall World Superbike Championship standings after scoring a season-best fourth place finish at Assen.

Maintaining his run of top ten finishes this season - only he and Noriyuki Haga can claim to have done so -, Spies put his second row starting position to good use in the first race, rising to sixth before passing Jakub Smrz and Max Neukirchner to move into fourth.

Holding onto the position for the remainder of the race to record a season-best result on the Yamaha, Sykes was nonetheless disappointed not to have been able to keep up with early sparring partner Leon Haslam.

"The first race went okay, I was pretty pleased with the results," he said. "I managed to make a couple of passes early and move up but then lost some feeling in the front which held me back."

Sykes' race two hopes were undone by a poor start that left him outside the top ten in the early stages. However, while he would fight back to finish an eventual sixth place, Sykes admits the result didn't live up to his potential.

"Race two was not what I expected. I got a horrendous start and left myself a lot of work to do. I worked hard over the next few laps to make some passes but unfortunately let the front group get away.

"I was bitterly disappointed with that because I knew I could run with the front. I'd just like to thank all the boys for this weekend putting so much hard work in. We had two offs and I left them with some work to do but they came through and had my bikes ready for me to race."

Sykes sits just ten points behind fourth place Michel Fabrizio in the points standings.