Mattias Olsson (pictured left) remained atop the qualifying leaderboard at the 6th Sofia International Open to lead a field of 56 players into Sunday's finals at bowling center Joy Station in Sofia, Bulgaria.

Olsson led the 260-player field from 29 countries with 1515 total and an average of 252.50 for six games. He survived a strong charge by Autum Chamberlain (right) of England, who toppled 1460 on Saturday, an average of 243.33, and added 48 pins women's handicap to land in second place with 1508.

Places 3, 4 and 5 belonged to Swedish bowlers. Mattias Wetterberg, who finished his 1484 series with back-to-back 300 games, was third, followed by Daniel Fransson in fourth place on 1464 and Pontus Andersson in fifth place with 1463.

Paul Moor (left) of England, the European Bowling Tour's all-time leader in wins with 16 titles, used a perfect game to improve his previous high series of 1437 by 22 pins and to maintain sixth place with 1459.

Chris Sloan, a two-handed player from Ireland, slipped to seventh place with 1447. Rounding out the top 8, who will receive two byes for the finals, Nadezda Korablinova (right) of Russia, with 1432 and an average of 238.67, including eight pins handicap each game. Seven out of 37 women survived the qualifying cut.

The next eight players will bypass the first round of the finals. Sam Rose of England hit the cutoff number for 16th place with 1414 or an average of 235.67. Alessandro Silletti of Poland also achieved perfection on the final qualifying day to make the cut in 20th place with 1406.

Three players, Anže Grabrijan (left) of Slovenia, Mehmet Kaya (right) of Turkey and Matt Chamberlain of England, tied for the last two spots at 1371 (228.50). Grabrijan (258) and Kaya (221) booked their spots in the finals due to the higher last game than Chamberlain (215), who was the first man out. However, he managed to roll a high game late night to advance from the Desperado Squad.