The two-time PBA50 Tour winner leads the first round of the PBA50 Treasure Island Resort & Casino World Championship presented by Storm after posting a 1,215 five-game pinfall total on games of 258, 245, 259, 195 and 258 Monday at Island Xtreme Bowl in Welch, Minn.

“It’s the small things, but the small things are getting harder and harder to fix,” said the 52-year-old Duke, whose last win came as a PBA50 Tour rookie in the 2014 Suncoast PBA Senior U.S. Open. “I’m still working through things in my game. I want to be as good as I’ve ever been but that’s a more demanding undertaking at my age.”

Duke, who ranks third all-time on the PBA Tour with 38 titles, has a best PBA50 Tour finish of second this season which came in the season opening Pasco County Florida Open.

The third major of the 2016 PBA50 Tour season provides a test of versatility and endurance by employing qualifying, match play and stepladder final stages on the PBA’s Viper, Chameleon and Scorpion lane conditions.

“The biggest test here is getting all the pins you can on three different lane conditions,” Duke said. “Ultimately, I’m trying to build a game that is going to withstand the grind of a tournament like this and that’s where refining the small things in my game I hope will pay off.”

The entire field bowled the Viper qualifying stage Monday and will return for the Chameleon qualifying round on Tuesday and the Scorpion qualifying round on Wednesday. After those three rounds, the top 24 qualifiers will advance to World Championship match play on Saturday at 8:30 a.m.

Monday’s qualifying also determined the top 24 players who will advance to the Treasure Island Resort & Casino Viper championship match play round Thursday morning. After Thursday’s match play the top five will advance to the Viper stepladder finals on Friday at 12:30 p.m. which will award a PBA50 regional title to the winner.

Duke leads a pair of PBA60 players, 60-year-old David Axon (above left) of Bellevue, Neb., in second with a 1,204 pinfall and 61-year-old Sam Maccarone (above right) of Blackwood, N.J., in third with 1,201 which included a 300 game.

Trying for his third consecutive major title of the season, Hall of Famer and defending PBA50 Player of the Year Pete Weber (left) of St. Ann, Mo., is in fourth finishing the first round with a 1,195 pinfall.

The 53-year-old is looking to build on a record-breaking season in which he has won a record five titles including four consecutive. His two major wins were the PBA Senior U.S. Open and the United States Bowling Congress Senior Masters in June.

Three-time PBA50 Tour winner Bob Learn Jr. (right) rounded out the top five with a 1,190 pinfall which also included a 300 game. The PBA50 World Championship is covered live on PBA’s online bowling channel Xtra Frame.

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Players with position, hometown and 5-game total. Top 24 also advance to Thursday’s Treasure Island Resort & Casino Viper Championship match play round. *indicates players cashing in Viper Championship regional prize list; ss-denotes PBA60 players ages 60 and over cashing for $200 in Viper Championship; n-denotes non-member

1, Norm Duke, Clermont, Fla., 1,215
2, David Axon, Bellevue, Neb., 1,204
3, Sam Maccarone, Blackwood, N.J., 1,201
4, Pete Weber, St. Ann, Mo., 1,195
5, Bob Learn Jr., Erie, Pa., 1,190
6, Ron Mohr, Las Vegas, 1,180
7, Mark Williams, Beaumont, Texas, 1,172
8, (tie) Tom Carter, Columbus, Ohio, and Mike Scroggins, Amarillo, Texas, 1,163
10, Parker Bohn III, Jackson, N.J., 1,150
11, Randy Scharf, Gillette, Wyo., 1,141
12, Bryan Goebel, Shawnee, Kan., 1,133
13, Bo Goergen, Sanford, Mich., 1,128
14, (tie) John Dudak, Orland Park, Ill., and Mike Dias, Lafayette, Colo., 1,126
16, Al Danz Jr., Escanaba, Mich., 1,124
17, James Knoblauch, Waukesha, Wis., 1,122
18, Ron Nelson Jr, Bridgeview, Ill., 1,118
19, Sammy Ventura, Syracuse, N.Y., 1,116
20, Walter Ray Williams Jr., Oxford, Fla., 1,115
21, Lennie Boresch Jr., Kenosha, Wis., 1,114
22, Dave Han, Hoover, Ala., 1,097
23, Tracy Teeters, Eugene, Ore., 1,087
24, Brian Kretzer, Dayton, Ohio, 1,080

25, *Harry Sullins, Chesterfield Twp., Mich., 1,075, $250
26, *Steve Stein, Staten Island, N.Y., 1,070, $250
27, *Steven Jansson, Barnes, Wis., 1,067, $250
28, Kenny Parks, Hammond, Ind., 1,059
29, Scott Greiner, Platte City, Mo., 1,052
30, Robert Brown, Cody, Wyo., 1,047
31, Mark Sullivan, Indianapolis, 1,044
32, Stoney Baker, Canton, Ga., 1,043
33, ss-Bill Henson, Westerville, Ohio, 1,040, $200
34, Dale Traber, Cedarburg, Wis., 1,036
35, Brian LeClair, Delmar, N.Y., 1,034
36, Bob Micek, Woodbury, Minn., 1,028
37, Ricky Schissler, Brighton, Colo., 1,027
38, Tommy Martin, Olive Branch, Miss., 1,026
39, ss-Paul McCordic, Sugar Land, Texas, 1,024, $200
40, ss-Warren Nelson, Middleburg, Fla., 1,022, $200
40, ss-Tim Pierce, Portland, Ore., 1,022, $200
42, Amleto Monacelli, Venezuela, 1,021
43, Christopher Keane, Cape Coral, Fla., 1,020
43, Andrew Frawley, Australia, 1,020
45, David Taylor, Largo, Fla., 1,017
46, (tie) Warren Burr, Wilmington, Del., and Don Breeden, Clive, Iowa, 1,016
48, ss-Paul Mielens, Menomonie, Wis., 1,013, $200
49, n-Sam Lantto, Eden Prairie, Minn., 1,011
50, Jerry Sikora, Gibbon, Minn., 1,006
51, Bobby Nelson, Las Vegas, Nev., 1,005
52, Danny Clark, New Palestine, Ind., 996
53, ss-Bill Nichols, Bella Vista, Calif., 992, $200
54, Lyle Zikes, Arlington Heights, Ill., 990
55, (tie) ss-Mike Schmid, St. Paul, Minn., 986, $200, and n-David Oulman, Medford, Minn., 986
57, Brian Cooper, Henderson, Nev., 985
58, ss-Kerry Fulford, Ft. Worth, Texas, 984, $200
59, Randy Peterson, Carrington, N.D., 983
60, David Williams Jr., Omaha, Neb., 981
61, Jeffrey Taylor, Madison, Wis., 975
62, William Keenan Jr., Orlando, Fla., 973
63, Fred Cole, Visalia, Calif., 969
64, Gary Alstott, Washington, Ill., 967
65, Mike Keough, Stockton, Calif., 960
66, (tie) Gary Kammes, Winfield, Ill., and Todd Kjell, Roscoe, Ill., 958
68, Brendan Bierch, Grafton, Mass., 956
69, Dale Eagle, Twin Falls, Idaho, 954
70, Kenneth Bland Jr., Cibilo, Texas, 945
71, Dana Wright, St. Paul, Minn., 942
72, Glenn Morgan, Carson City, Nev., 941
73, Patrick King, Yankton, S.D., 936
74, n-Mike Morris, Fargo, N.D., 929
75, Don Herrington, Ballston Lake, N.Y., 927
76, Ted Staikoff, Black Hawk, S.D., 924
77, n-Ron Cleveland, St. Paul, Minn., 917
78, Dean Bruinsma, Clear Lake, S.D., 916
79, (tie) Galen Keas, Alda, Neb., and John Conroy, Mahopac, N.Y., 906
81, Edward Silva, Manteca, Calif., 886
82, Eugene Captain, Bertha, Minn., 843
83, Jerry Brunette Jr., Rochester, N.Y., 786

300 games (2) – Bob Learn Jr., Sam Maccarone