By CompuBox

Here's a look at where Gennady Golovkin (last 14 fights) ranks among CompuBox Categorical Leaders: 10.4 landed jabs per round (#1 & double middle. avg.); 33.5% jabs connect pct. (#1); 39.0% connect pct. (#2); 25.1 punches landed per round (#4); +11.5 plus/minus rating (#8); opponents landed 35.5% of their power punches and just 14.4% of GGG's landed punches are body shots (CompuBox Avg.: 22.3%).

Martirosyan (last 4 fights, all at 154 lbs.) threw and landed below the wgt. class avg., while opponents landed 41.7% of their power punches, outlanding Vanes 8.8 to 8.6 in that category.

Undefeated middleweight titleholder Gennady Golovkin (37-0-1, 33 KOs) from Karaganda, Kazakhstan, now living in Los Angeles, takes on Vanes Martirosyan (36-3-1, 21 KOs) from Abovyan, Armenia, now living in Glendale, Calif., in a 12-round championship bout.

Golovkin, 36, looks to defend his middleweight title successfully for the 20th time, a feat previously accomplished only by surefire Hall-of-Famer Bernard Hopkins. Despite battling Canelo Alvarez to a stirring 12-round draw last September, Golovkin boasts an astonishing 87% knockout-to-win ratio. He’s coming off back-to-back efforts against Alvarez and Daniel Jacobs, perhaps the finest opponents in the 160-pound division.

Martirosyan, 31, is moving from the super welterweight division to 160 pounds to challenge “GGG,” and will be seeking a title for the third time.

Both fighters were amateur standouts who appeared in the 2004 Olympic Games, with Martirosyan representing his adopted nation of America, while Golovkin won a silver medal for Kazakhstan. Boasting a combined pro record of 73-3-2, 54 KOs, Golovkin and Martirosyan have a 94% winning percentage.

The opening bout marks the first women’s boxing match on HBO, with Cecilia Braekhus of Cartagena, Colombia (32-0, 9 KOs) meeting Kali Reis (13-6-1, 4 KOs) from Providence, RI, in a ten-round welterweight title bout. Braekhus seeks to extend her nine-year world championship reign in her 22nd consecutive title defense.