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Sailor · 2010–2026

Jr. John Greifzu

stamford yacht club PHRF handicapJ/109Laser

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Events
172

679 races · 129 race wins

Win rate
17%

17% win rate · 30 of 172

Podium rate
52%

89 top-three finishes

Typically beats
53%

of boats faced (90%: 51%–54%, 1,806 boats)

Best class ranking
#7

Helm in J/109 · rating 389

Longest win streak
6

race wins in a row

Most successful partnership
Kevin Costello

10 wins · 17 podiums in 28 events together · 36% win rate

Best trio
Kevin Costello & Malcolm Kriegel

8 wins · 12 podiums in 18 events, all three aboard

Biggest lift
Chase Latour

+23 points of fleet beaten when sailing together

Longest-running crew
Chris Mangieri

May 2015 – Aug 2025 · 9 events

Nemesis
David Rosow

23–127 head to head in 150 races

Rival
Bengt Johansson

77–80 in 158 races

Best day
6 Aug 2026

1-1-2-1-4-1-2-1-1-4 · 2026 NBYC Annual Regatta - J109 North Americans, Sandpiper Nationals, Buzzards Bay ILCA Masters Championship · about 1 in 883 by chance

Signature result
1st of 14

2022 Vineyard Race · PHRF handicap · 2 Sep 2022

Partnerships · 60+ sailors

Most successful partnership: Kevin Costello — 10 wins · 17 podiums in 28 events together · 36% win rate
  • Malcolm Kriegel · Growth Spurt, Growth Spurt x Northstar, Windborn · J/109, ORC handicap, PHRF handicap 35events 10 wins together · 20 podiums · 29% win rate · 36 of 210 races won Beat 74% of the fleet together(+16 vs. without) · best 1st · Jul 2016 – Aug 2026
  • John Hughes · Growth Spurt · J/109, ORC handicap, PHRF handicap 33events 8 wins together · 17 podiums · 24% win rate · 26 of 174 races won Beat 69% of the fleet together(+9 vs. without) · best 1st · Oct 2016 – Aug 2026
  • Joe Quick · Growth Spurt, Growth Spurt x Northstar, Growth Spurt x Slapshot II, Windborn · J/109, ORC handicap, PHRF handicap 33events 3 wins together · 15 podiums · 9% win rate · 12 of 150 races won Beat 63% of the fleet together(+2 vs. without) · best 1st · May 2016 – Sep 2026
  • Kevin Costello · Growth Spurt, Growth Spurt x Slapshot II · J/109, ORC handicap, PHRF handicap 28events 10 wins together · 17 podiums · 36% win rate · 30 of 131 races won Beat 73% of the fleet together(+14 vs. without) · best 1st · Jun 2020 – Sep 2026
  • Gwynie Dunlevy · Growth Spurt, Growth Spurt x Northstar · J/109, ORC handicap, PHRF handicap 22events 6 wins together · 12 podiums · 27% win rate · 17 of 107 races won Beat 73% of the fleet together(+14 vs. without) · best 1st · Jun 2018 – Aug 2025
  • Wes Bemus · Growth Spurt, Growth Spurt x Northstar, Growth Spurt x Slapshot II · J/109, PHRF handicap 21events 8 wins together · 12 podiums · 38% win rate · 34 of 143 races won Beat 79% of the fleet together(+20 vs. without) · best 1st · Sep 2017 – Aug 2026
  • Ellen Quinn · Growth Spurt · J/109, PHRF handicap 20events 6 wins together · 12 podiums · 30% win rate · 24 of 129 races won Beat 80% of the fleet together(+21 vs. without) · best 1st · Sep 2017 – Sep 2026
  • Jason Raymond · Growth Spurt, Growth Spurt x Northstar · J/109, ORC handicap, PHRF handicap 20events 8 wins together · 14 podiums · 40% win rate · 28 of 94 races won Beat 78% of the fleet together(+19 vs. without) · best 1st · May 2021 – Aug 2026
  • Richard Born · Growth Spurt, Windborn · J/109, ORC handicap, PHRF handicap 17events 2 wins together · 8 podiums · 12% win rate · 3 of 62 races won Beat 65% of the fleet together(+4 vs. without) · best 1st · Sep 2016 – Sep 2023
  • Thomas Brennan · Growth Spurt · J/109, PHRF handicap 16events 6 wins together · 13 podiums · 38% win rate · 23 of 73 races won Beat 79% of the fleet together(+20 vs. without) · best 1st · Sep 2021 – Sep 2026

Lift shows how much better this sailor finishes with that partner aboard.

Rating history

-4518441320122014201620182020202220242026Helm rating, all classesCrew rating, all classes

— Helm rating, all classes · - - Crew rating, all classes

Event history · 172

DateEventBoatClassRoleFinish
4 Sep 20262026 Vineyard RaceGrowth SpurtPHRF handicapSkipper2nd / 6
30 Aug 2026COMMODORE’S CUP for the Drake H. Sparkman III Memorial TrophyGrowth SpurtPHRF handicapHelm3rd / 7
21 Aug 20262026 Stamford Overnight RaceGrowth SpurtPHRF handicapSkipper1st / 6
6 Aug 20262026 NBYC Annual Regatta - J109 North Americans, Sandpiper Nationals, Buzzards Bay ILCA Masters ChampionshipGrowth SpurtJ/109Skipper1st / 6
5 Aug 2026JSA Championship for Club 420 & ILCA, including JSA Girls ChampionshipsJohn Greifzu IIILaserSkipper2nd / 8
14 Jul 20262026 Breakwater Irregulars - Summer SeriesGrowth SpurtPHRF handicapSkipper3rd / 6
13 Jul 20262026 Larchmont Junior Race Week@fat_and_skinny_food_reviewsLaserSkipper3rd / 7
11 Jul 2026128th Larchmont Race WeekGrowth SpurtJ/109Skipper1st / 5
9 Jul 20262026 | Pequot Invitational (C420, FEVA, ILCA)@fat_and_skinny_food_reviewsLaserSkipper2nd / 2
2 Jul 2026Eastern Districts ILCA Class 2026@fat_and_skinny_food_reviewsLaserSkipper3rd / 5
29 Jun 2026Commodore Law Trophy 2026@fat_and_skinny_food_reviewsLaserSkipper1st / 4
27 Jun 202695th RYC Stratford Shoal RaceGrowth SpurtPHRF handicapSkipper5th / 7
6 Jun 20262026 Pequot Yacht Club J-109 Invitational RegattaGrowth SpurtJ/109Skipper3rd / 8
29 May 20262026 Stamford Yacht Club Friday Night SeriesGrowth SpurtPHRF handicapSkipper2nd / 11
19 May 20262026 Breakwater Irregulars - Spring SeriesGrowth SpurtPHRF handicapSkipper1st / 6
20 Sep 20252025 Stamford Yacht Club Cows RaceGrowth SpurtPHRF handicapSkipper5th / 7
29 Aug 20252025 Vineyard RaceGrowth SpurtPHRF handicapSkipper2nd / 4
22 Aug 20252025 Verve Cup Inshore and J109 North American ChampionshipGrowth Spurt x NorthstarJ/109Crew2nd / 9
8 Aug 20252025 Safe Harbor Race WeekendGrowth SpurtPHRF handicapSkipper2nd / 6
5 Aug 20252025 RYC - JSA Laser, C420, & Girls Champs@fat_and_skinny_food_reviewsLaserSkipper9th / 11
29 Jul 20252025 Beach Point Annual Junior Overnight RaceValiantPHRF handicapHelm5th / 9
24 Jul 20252025 Cedar Point Yacht Club Jr. Race WeekJohn Greifzu IIILaserSkipper5th / 6
15 Jul 20252025 Breakwater Irregulars - Summer SeriesGrowth SpurtPHRF handicapSkipper2nd / 7
14 Jul 20252025 Larchmont Junior Race Week@fat_and_skinny_food_reviewsLaserSkipper3rd / 12
12 Jul 20252025 LHYC Stratford Shoal RaceGrowth SpurtHandicapSkipper1st / 5

Helm rating across all classes: 308 (±75), #9,413.Crew rating across all classes: 226 (±216), #12,658. Compiled from public results; not an official ranking.