GROM

Who is GROM

GROM is a brawler of Epic rarity, class Artillery. This article summarizes their performance in the current competitive meta: best map, hardest counters, and the weekly trend of their win rate. The numbers come from top-PRO battles over the last 90 days, Bayesian-smoothed so a brawler with a small sample doesn't show a misleading percentage.

Over the 30-day window, GROM has shown up in 1,089 battles with a global win rate of 64.1%. That window belongs to the figure itself and is shorter than the one feeding the rest of the page, because a win rate needs recent data so it doesn't drag along a meta that already moved on.

Across the full 90 days, GROM has a pick rate of 0.6%. That pick rate is the share of matches where a top-PRO player chose GROM out of every available brawler, so it works as a thermometer for how meta they are right now. It uses the long window on purpose, because a brawler's popularity shifts more slowly than their win rate.

The two figures for GROM tell different things. The observed win rate, 64.1%, measures how often it wins in the hands of a top 200 player from its country. The discounted strength, 46.4%, estimates how often it would win against a mid-level opponent once the mix of opponents it happened to face is discounted. The first one orders the lists across the site and the second sits beside it, as context.

GROM is an Epic brawler, a rarity where kits start to break conventions: unique mechanics, supers with special effects and gadgets that flip the whole game plan. The gem or Starr Drop investment is steeper, but in return you get a tool that defines entire lanes in draft and tends to be picked in tournaments whenever its signature map enters rotation.

As Artillery, the projectile arcs over walls, so the job is to make ground unusable rather than to win duels. Damage lands where the enemy is forced to stand — on the objective, in a choke, behind the cover that would otherwise be safe — which is why the class decides matches without ever holding the front line. Closed maps with tight lanes are the natural niche; open ground removes the walls that make the arc worth anything, and any brawler that closes the distance wins the exchange outright.

Best maps for GROM

The best map for GROM is Nutmeg in Brawl Ball, with a Bayesian-adjusted win rate of 85.9% over 45 battles. That puts them above their class average in this mode, so it's worth picking GROM when that rotation is live. A strong run on Nutmeg usually combines favorable geometry (short ranges or cover) and a mode whose objective plays into the brawler's kit.

GROM's performance is highly map-dependent: there are 30.3 percentage points between their best and worst map. That high variance means it pays to check the rotation before locking them in, because the same brawler swings from one of the best options to a clearly unfavorable pick depending on the map.

As a second map option, GROM also performs well on Flowing Springs (Knockout) with a 80.0% win rate, only 5.9 points off their best map. When the gap between the top two maps is this small, picking one over the other comes down to the enemy team more than the brawler itself.

Rounding out the podium, GROM holds a 77.9% win rate on Bustling Business (Brawl Ball) over 36 battles. Having three competitive maps widens the rotation windows worth bringing them in for, not just their signature map.

Just above their worst result, GROM also struggles on Flaring Phoenix, where their win rate sits at 62.5%. Keep this map on your radar as a second warning sign when deciding the pick.

On the opposite end, Pinhole Punt (Brawl Ball) drops GROM's win rate to 55.6%. That's the bottom tail of a 30.3-point range between their best and worst map, so if that rotation comes up during a session, consider a different brawler to avoid throwing matches.

Counters and matchups

GROM clearly dominates the matchup against CROW: across the 45 recorded battles for that pairing, their win rate climbs to 79.2%. If you spot CROW on the enemy team in draft, that lane is an edge for GROM — seek the duel out rather than avoid it.

Their second-best matchup is against GRIFF, where GROM holds a 76.8% win rate over 63 battles. Two strong favorable counters like these give GROM real value as a targeted pick against comps that lean on those two brawlers.

Where GROM has a clear disadvantage is against EL PRIMO: their win rate drops to 52.6% across the 45 battles recorded for that matchup. If EL PRIMO shows up on the enemy team, consider not picking GROM or changing the game plan to avoid the shared lane, because EL PRIMO wins that exchange.

Per-brawler matchups are the smallest-sample metric on the page: for GROM the samples range from 35 to 150 battles. Read them with the confidence that sample implies — a matchup at the low end says far less than one backed by the high one.

This section lists the matchups where GROM performs worst and best over the last 30 days, sampled from top PRO players and smoothed with Bayesian WR to avoid noise.

Read each row left to right: brawler, win rate vs GROM, and battle sample. The larger the sample, the more reliable the number.

Loses most against

Brawler	WR	Battles
EL PRIMO	52.6%	45
GRAY	55.9%	62
GUS	59.1%	150
MORTIS	59.4%	139
BULL	62.2%	35

Dominates

Brawler	WR	Battles
CROW	79.2%	45
GRIFF	76.8%	63
TICK	74.5%	78
FANG	71.8%	50
RICO	71.7%	117

Star Powers, Gadgets and Hypercharge

To get the most out of GROM in the current meta, prioritize upgrades by synergy with their kit, not by gem cost. Star powers, gadgets and hypercharge change tiers depending on the meta, so the upgrade priority is dynamic.

As a general rule, the first profitable upgrade for GROM is usually the star power with the highest pick rate in PRO tournaments, followed by the gadget that best fits their role (lane, support, or pick). Hypercharge, when it exists, comes last because it costs more Coins and Power Points and only triggers with a full super bar.

By game mode, GROM performs best in Knockout, with a 70.6% win rate over 1,449 battles — the mode with the most recorded sample for this brawler. That makes Knockout the context where their performance is most reliable and where investing in upgrades pays off most clearly.

Beyond the immediate meta, the upgrade path for GROM should prioritize what moves the win rate needle the most: power 11 before gears, first star power before second, primary gadget before any hypercharge. Hypercharges cost a lot of coins and power points and only activate with a full super bar, so their real priority drops toward the end of the checklist.

Weekly meta analysis

Over the last 7 days, GROM's win rate moved from 62.2% to 66.9%, a climb of +4.7 points versus the previous half of the window. Since each half clears the 3-battle minimum, that move isn't noise: it reflects the meta shifting in GROM's favor, usually from a rotation of maps or modes where they perform better.

Every percentage on the GROM page comes from real battles played by the world's top players, aggregated with statistical smoothing and recomputed every six hours. If you want to understand why one map performs better than another or how a rotation affects the win rate, the methodology page covers the technical detail step by step.