TournamentSan Diego XVIII Gi - Mar 2026
[ grey / Youth ]CA
Guy Mastrelli
Jits
1,360Prospect
~40 Jits to Advanced
+540Last event: Mar 1, 2026
#39,714
Overall
Top 44%
Percentile
#13,052
grey Belt
Record
17-1357% Win Rate
17 Wins13 Losses
W
W
L
W
W
4-1 Last 5
Trophy Case
2 GoldGRAPPLING-X 1 · JJWL 1Fighter Intelligence
13 TournamentsMedals
10Medals
across 13 tournaments
Gold 2
Silver 4
Bronze 4
20% Gold Rate
Belt Avg 40%
What this means20% of tournament entries result in gold — 20 points below the belt average. Still building a medal collection at this level.
Finishing Ability
65%
Subs
Submission 11
Points 5
Other 1
Belt Avg 59%
+6 pts vs belt avg
What this means65% of wins by submission — 6 points above the belt average. This fighter has elite finishing ability for their rank.
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Advanced Analytics
AI CalculatedGrowth Trajectory
DVIHolding Steady
Competitive — holding steady
Growing faster than 21% of peers
Win Quality
Overachiever
Clutch Score: +6.2%
17
Close Wins
13
Losses
Best win: Beat Diego Zepeda (1279 pts higher)
30 matches analyzed
Format Split
GI SPECIALIST30 Gi0 NoGi
Gi
17W-13L57%
NoGi
0W-0L—%
Sub Rate
Gi 37%NoGi 0%
57% win rate delta — Gi stronger
Segment Analysis
Malegrey BeltAges 10-1129,089 FightersComparing to 29,089 grey belt fighters
Win Rate
58%avg 67%
AVG
-8 pts vs avg
Sub Rate
65%avg 59%
AVG
+6 pts vs avg
Gold Rate
15%avg 40%
AVG
-25 pts vs avg
What This Means
Win rate tracks at 58% for grey belt. 31 matches and counting.
Tale of the Tape
Next Tournaments
JJWL
San Diego Xviii GiMar 28, 2026
MaleGi · Pre Teen 2015-2016 · grey·90-99
| # | Name | JITS | Academy | Record |
|---|---|---|---|---|
| 1 | Lucca Antunes | 6,133 | Honor Roll BJJ | 35-6 |
| 2 | Cassius Espiritu | 3,598 | One Jiu Jitsu HQ | 22-13 |
| 3 | James Corwin | 1,763 | Praia Brazilian Jiu-jitsu | 9-11 |
| 4 | Jack Dillon | 1,634 | Checkmat Fallbrook | 8-7 |
| 5 | Ricardo Garcia | 1,527 | New Breed MMA and Fitness. | 16-12 |
| 6 | Guy Mastrelli | 1,360 | Silva Jiu Jitsu Academy | 17-13 |
| 7 | John Cueva JR | 1,312 | Lvl 5 Jiu Jitsu | 5-7 |
| 8 | Lennon Rivera | 1,094 | Carlson Gracie Temecula | 6-11 |
| 9 | Jayden Kopenski | 1,082 | Strong Base Jiu Jitsu | 2-5 |
| 10 | Maximo Flores | 1,072 | Ufc Rosemead | 1-5 |
| 11 | Mason Sampsel | 1,032 | Dune Sea Grappling Club | 0-9 |
11 Fighters — Multiple brackets · 2–3 wins to gold
Your chance to win gold: 4%
Fighter History
30 matches
| Result | Method | Fighter | JITS | Academy | Bracket | Video | Tournament | Format | Date |
|---|---|---|---|---|---|---|---|---|---|
| W | SUB | 1026+210 | Carlson Gracie Temecula | Grey Gi-- Youth Divisions · 9-10 · Grey · 9-10 · 80.1- 90 Lbs 9-10 Years Old | Gi | Mar 1, 2026 | |||
| W | SUB | 1229+270 | Dedicated Jiu Jitsu | Grey Gi-- Youth Divisions · 9-10 · Grey · 9-10 · 80.1- 90 Lbs 9-10 Years Old | Gi | Mar 1, 2026 | |||
| L | PTS | 2321-130 | Empire Brazilian Jiu Jitsu | Grey Gi-- Youth Divisions · 9-10 · Grey · 9-10 · 80.1- 90 Lbs 9-10 Years Old | Gi | Mar 1, 2026 | |||
| W | SUB | 1026+190 | Carlson Gracie Temecula | Grey Gi-- Youth Divisions · 9-10 · Grey · 9-10 · 80.1- 90 Lbs 9-10 Years Old | Gi | Mar 1, 2026 | |||
| W | SUB | 1285+290 | Rada | - Teen · 10-11 · White-grey · Light-heavyweight · Light-heavyweight (tap Cancer Out BJJ Open) | TAP-CANCER-OUTTap Cancer Out 2026 San Diego BJJ Open | Gi | Feb 15, 2026 | ||
| W | SUB | 1389+200 | Rada | - Teen · 10-11 · White-grey · Light-heavyweight · Light-heavyweight (tap Cancer Out BJJ Open) | TAP-CANCER-OUTTap Cancer Out 2026 San Diego BJJ Open | Gi | Feb 15, 2026 | ||
| L | PTS | 1341-300 | Rada | - Teen · 10-11 · White-grey · Light-heavyweight · Light-heavyweight (tap Cancer Out BJJ Open) | TAP-CANCER-OUTTap Cancer Out 2026 San Diego BJJ Open | Gi | Feb 15, 2026 | ||
| L | SUB | 1714-410 | Alex Martins Brazilian Jiu Jitsu | Grey Intermediate · 10-11 · 90-100 | NAGASan Diego | Gi | Jan 31, 2026 | ||
| L | SUB | 1714-550 | Alex Martins Brazilian Jiu Jitsu | Grey Intermediate · 10-11 · 90-100 | NAGASan Diego | Gi | Jan 31, 2026 | ||
| W | PTS | 1261+190 | Team Ironman Ultimate Training | Grey Gi-- Youth Divisions · 9-10 · Grey · 9-10 · 90.1- 100 Lbs 9-10 Years Old | Gi | Jan 25, 2026 |
From Silva Jiu Jitsu Academy
See all →
Scouting Report
Data Sources
Matches30
Placements12
Tournaments13
Medals🥇 2🥈 4🥉 4
Sources
GRAPPLING-XTAP-CANCER-OUTNAGAJJWL
First MatchJan 2025
Last MatchMar 2026
Stats verified from completed tournaments only, may not represent a fighter's true record.
FloGrappling Videos
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About
Guy Mastrelli is a Grey belt from Silva Jiu Jitsu Academy in Lawndale, CA competing across 5 tournaments. His 17% submission rate ranks in the top 29% of Grey belts—28 points above the 45% belt average. Mastrelli holds 1 gold and 2 silver medals from 13 total matches, placing him in the 74th global percentile with a JITS rating of 1785. Mastrelli's 6 competitive wins came entirely against higher-rated opponents, including a notable upset over Diego Zepeda (796-point gap).
His development velocity sits at -29.5 pts/month, ranking him in the 16th percentile DVI and indicating a holding_steady trend. He competes exclusively in gi format (13 matches, 1065 rating) across JJWL and NAGA organizations, with tournament success concentrated at San Diego XVII Gi Youth (1 gold) and two NAGA San Diego events (2 silvers).
Frequently Asked Questions
Guy Mastrelli has a 18-13 competition record across 31 matches in 13 tournaments.
Guy Mastrelli is ranked #39714 overall and #13052 among grey belt competitors on Jits.gg.
Guy Mastrelli has earned 2 gold, 4 silver, 4 bronze medals across 13 tournaments.
Guy Mastrelli trains at Silva Jiu Jitsu Academy and competes as a grey belt.
Guy Mastrelli has a 65% submission rate and a 58% win rate across 31 matches.
Guy Mastrelli is ranked #13052 among grey belt competitors on Jits.gg.
Guy Mastrelli's current Jits rating is 1360. Use the Rating Simulator on Guy Mastrelli's profile to see how a win or loss against any opponent would affect their rating. Factors include opponent strength, match method (submission vs points), and margin of victory.