Sailor · 2018–2025

Guus Groeneveld

zv de roerkoning Formula 18 Handicap F18

Search sailors · About these ratings

Events: 10
Win rate: 0%
Podium rate: 0%
Typically beats: 53%
Best class ranking: #63
Longest win streak: 2

Longest-running crew: Mark Klaaijsen
Nemesis: Hans van Dam
Rival: Arjan Baas
Best day: 19 May 2018
Signature result: 4th of 46

Partnerships · 2 sailors

Mark Klaaijsen · Nacra evolution, Nacra Evolution, Nacra infusion, Nacra Infusion MKII · F18, Formula 18, Formula 18 (World Championship), Handicap 9events 0 wins together · 0 podiums · 0% win rate · 0 of 62 races won Beat 54% of the fleet together · best 4th · Jun 2019 – Oct 2025
Mark Claaijsen · Nacra infusion · Formula 18 1events 0 wins together · 0 podiums · 1 events · 2 of 8 races won Beat 70% of the fleet together · best 4th · May 2018 – May 2018

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

Rating history

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

Event history · 10

Date	Event	Boat	Class	Role	Finish
11 Oct 2025	Ronde Tiengemeten 2025	Nacra evolution	Handicap	Crew	6th / 43
8 Jul 2025	2025 Formula 18 World Championship	Nacra Evolution	F18	Crew	46th / 96
17 May 2025	F18 & F16 Belgian - Dutch - German Nationals	Nacra Evolution	F18	Crew	9th / 22
12 Oct 2024	Ronde Tiengemeten 2024	Nacra Infusion MKII	Handicap	Crew	4th / 46
16 Sep 2023	2023 Open Dutch Championships Finn, Dart 18, F18 Class Event F16	Nacra Infusion MKII	Formula 18	Crew	10th / 16
24 Jul 2023	134. Travemünder Woche 2023	Nacra Infusion MKII	Formula 18 (World Championship)	Crew	76th / 97
8 Oct 2022	Ronde Tiengemeten	Nacra Infusion MKII	Handicap	Crew	23rd / 46
18 Sep 2020	Open Dutch Sailing Championships 2020	Nacra infusion	Formula 18	Skipper	8th / 16
9 Jun 2019	North Sea Regatta 2019	Nacra infusion	Formula 18	Skipper	7th / 9
19 May 2018	North Sea Regatta 2018	Nacra infusion	Formula 18	Skipper	4th / 11

Ratings

Class	Rating	Rank	Impact
All classes Crew	122 provisional	#24141 band 12147–41653	—
Formula 18 Helm	-2 provisional	#63 band 41–82	—
All classes Helm	5 provisional	#50687 band 31990–67825	—

3 more classes, not yet ranked

F18 · Crew · 18 races, 2 events · rating 58
Formula 18 (World Championship) · Crew · 12 races, 1 event · rating -31
Formula 18 · Crew · 5 races, 1 event · rating 21

Rank among sailors with a substantial record, all time. In brackets, the ranks this rating cannot be told apart from. Impact is the points of fleet beaten that this sailor adds.

Helm and crew

As helm	3 events	0 wins	beats 49%
As crew	7 events	0 wins	beats 58%

How they race

Closer	−2 pts	last race of an event vs. the rest
Comeback	−17 pts	the race after a bottom-half finish
Consistency	55%	100% = the same result every event
Big fleets	61%	of the fleet beaten

Head to head

Helm	Races	W–L
Arjan Baas	67	34–31
Wik Becker	61	10–51
Rolph Spaas	54	33–20
Hans van Dam	51	1–50
Willie van der Heijden	50	35–13
Ad Noordzij	45	12–33
Maud van Toorenburg	40	27–13
Dirk Bleiker	37	9–28
Jolbert van Dijk	34	1–33
Tom Bruyneel	29	17–12
Jacob den Houting	29	6–20
Fredrik Karlsson	29	5–24

Most-beaten opponent: Willie van der Heijden (35–13).

Seasons

Year	Events	Beat
2025	3	68%
2024	1	93%
2023	2	31%
2022	1	51%
2020	1	53%
2019	1	25%
2018	1	70%

Boats

Nacra Infusion MKII · Handicap, Formula 18, Formula 18 (World Championship) · 4 events · 2022–2024
Nacra evolution · Handicap, F18 · 3 events · 2025
Nacra infusion · Formula 18 · 3 events · 2018–2020

Where they race

Unknown · 10 events

Is this you?

Claim it to merge duplicates and remove results that aren’t yours. Changes apply at the nightly rebuild.

Crew rating across all classes: 122, #24,141.Helm rating across all classes: 5, #50,687. Compiled from public results; not an official ranking.