Leagues

    USBC has data for Gregg G Sietsema starting from 2004.
    Sport/Challenge average conversions are located at the bottom of the page.

    Recent Composite Averages

    2025: 203 over 54 games (House)
    2022: 210 over 24 games (House)
    2020: 208 over 120 games (House)
    2019: 207 over 173 games (House)
    2018: 197 over 99 games (House)

    League Averages

    2025-2026

  • Vegas Express (W) - data not found

    2024-2025

  • Vegas Express (S) - 203 over 54 games

    2021-2022

  • Alley Cats / River Rats (W) - 210 over 24 games

    2019-2020

  • Vegas Or Bust (W) - 212 over 57 games
    Vegas Express (W) - 204 over 63 games

    2018-2019

  • Vegas Express (W) - 210 over 69 games
    Vegas Express (S) - 205 over 53 games
    Vegas Or Bust (S) - 205 over 51 games

    2017-2018

  • River Magic (W) - 203 over 48 games
    River Magic (S) - 192 over 51 games

    2016-2017

  • River Magic (W) - 207 over 39 games
    Aces Or Better (W) - 202 over 72 games
    Aces Or Better (S) - 201 over 60 games
    River Magic (S) - 197 over 60 games

    2015-2016

  • Hits & Misses (W) - 220 over 69 games
    Aces Or Better (W) - 212 over 75 games
    Aces Or Better (S) - 211 over 69 games
    Hits & Misses (S) - 210 over 72 games
    River Magic (S) - 205 over 66 games
    Lg. Of Our Own (W) - 202 over 51 games

    2014-2015

  • Lg. Of Our Own (W) - 224 over 60 games
    Aces Or Better (W) - 224 over 69 games
    Strike Me Green (W) - 223 over 75 games
    Lg. Of Our Own (S) - 222 over 78 games
    Strike Me Green (S) - 222 over 45 games
    Vegas Holiday (W) - 219 over 21 games
    Aces Or Better (S) - 219 over 75 games

    2013-2014

  • Vegas Holiday (S) - 230 over 30 games
    Lg. Of Our Own (W) - 226 over 15 games
    Thurs. Niters (W) - 222 over 87 games
    Strike Me Green (S) - 221 over 81 games
    Aces Or Better (S) - 217 over 70 games
    Hits & Misses (W) - 215 over 72 games
    Vegas Holiday (W) - 202 over 6 games
    Guys & Dolls (W) - 183 over 6 games

    2012-2013

  • Thurs. Niters (S) - 208 over 33 games
    Party Down (W) - 206 over 83 games
    Thurs. Niters (W) - 204 over 48 games
    Party Down (S) - 200 over 27 games

    2011-2012

  • Party Down (W) - 213 over 87 games
    Thurs. Niters (S) - 204 over 54 games
    Thurs. Niters (W) - 203 over 72 games
    Republic Concrete (W) - 197 over 3 games
    Party Down (S) - 194 over 45 games

    2010-2011

  • Thurs. Niters (W) - 206 over 60 games
    Party Down (S) - 205 over 45 games
    Party Down (W) - 205 over 81 games
    Thurs. Niters (S) - 201 over 78 games

    2009-2010

  • Party Down (S) - 205 over 45 games
    Party Down (W) - 204 over 82 games
    Thurs. Niters (S) - 203 over 69 games
    Thurs. Niters (W) - 203 over 63 games
    4 - 4 Vegas (S) - 194 over 72 games
    4 - 4 Vegas (W) - 193 over 69 games

    2008-2009

  • Thurs. Niters (S) - data not found
    Party Down (S) - data not found
    Party Down (W) - 200 over 84 games
    Thurs. Niters (W) - 199 over 57 games
    Sat. Vegas Special (W) - 191 over 87 games

    2007-2008

  • Party Down (S) - data not found
    Thurs. Niters (S) - data not found
    Party Down (W) - 199 over 75 games
    Double Down (W) - 197 over 72 games
    Showboaters (S) - 188 over 27 games

    2006-2007

  • Party Down (S) - data not found
    Double Down (S) - data not found
    PBA Experience (S) - data not found
    Party Down (W) - 203 over 84 games
    Double Down (W) - 190 over 75 games

    2005-2006

  • Party Down (S) - data not found
    Double Down (S) - data not found
    Double Down (W) - 201 over 75 games

    2004-2005

  • Double Down (S) - data not found
    Double Down (W) - 184 over 57 games

    2003-2004

  • Double Down (S) - data not found
    Double Down (W) - 186 over 71 games


Memberships

    Gregg G Sietsema has an active USBC membership.

    Current:

    Citrus Belt USBC - 2025-08-01 - 2026-07-31

    Past:

    Citrus Belt USBC - 2024-08-01 - 2025-07-31
    Orange County USBC - 2023-08-01 - 2024-07-31
    Orange County USBC - 2021-08-01 - 2022-07-31
    Citrus Belt USBC - 2019-08-01 - 2020-07-31
    Orange County USBC - 2019-08-01 - 2020-07-31
    Citrus Belt USBC - 2018-08-01 - 2019-07-31
    Orange County USBC - 2018-08-01 - 2019-07-31
    Orange County USBC - 2017-08-01 - 2018-07-31
    Orange County USBC - 2016-08-01 - 2017-07-31
    Orange County USBC - 2015-08-01 - 2016-07-31
    Orange County USBC - 2014-08-01 - 2015-07-31
    Orange County USBC - 2013-08-01 - 2014-07-31
    Orange County USBC - 2012-03-15 - 2013-07-31
    Orange County USBC - 2011-03-15 - 2012-07-31
    Orange County USBC - 2010-03-15 - 2011-07-31
    Orange County USBC - 2009-03-15 - 2010-07-31
    Orange County USBC - 2008-08-01 - 2009-07-31
    Citrus Belt USBC - 2007-08-01 - 2008-07-31
    Orange County USBC - 2007-08-01 - 2008-07-31
    Orange County USBC - 2006-03-15 - 2007-07-31
    Orange County USBC - 2005-08-01 - 2006-07-31
    San Gabriel Valley BA - 2004-08-01 - 2005-07-31
    Orange Cnty BA - 2003-08-01 - 2004-07-31
    Orange Cnty BA - 2001-03-15 - 2002-07-31

Honors

800 series (2)

  • 813 on September 2 2014 at Tustin Lanes - Games: 277-300-236
  • 800 on March 13 2014 at Tustin Lanes - Games: 257-276-267


    • 300 games (7)

  • 300 (Game 2) on September 17 2016 at South Point Bowling Center - Games: 191-300-216
  • 300 (Game 3) on February 19 2015 at Tustin Lanes - Games: 159-276-300
  • 300 (Game 3) on October 23 2014 at Tustin Lanes - Games: 202-278-300
  • 300 (Game 2) on September 2 2014 at Tustin Lanes - Games: 277-300-236
  • 300 (Game 3) on December 19 2013 at Tustin Lanes - Games: 270-215-300
  • 300 (Game 1) on December 8 2009 at New Yorba Linda Bowl - Games: 300-216-193
  • 300 (Game 2) on October 27 2007 at Linbrook Bowl - Games: 202-300-201


    • 11 in a row (1)

  • May 7 2005 at Bowlero Fullerton


    • Open Championships

    Entering Average: 175

    Why?

    If a bowler does not have a 27 game Open Championship Average, use the Highest Sport Adjusted Average of the last three bowling seasons.
    You currently have bowled 0 games out of the required 27.

    The Math

    Highest league is from: 2024/25
    203 (standard) -> 175 (sport)

    Open Championships average is the most recent 27 games bowled at the Open Championships from 2016 through 2025. To search historical scores from the Open Championships Leaderboard click here.