Undefeated WBA middleweight beltholder Gennady Golovkin weighed in at 165 pounds less than a month away from his Oct. 18 title defense against Marco Antonio Rubio, who weighed in at 174.5 pounds, according to a WBC-mandated 30-day advance weigh-in.

The advance in-camp weigh-in is part of a WBC program that monitors the weights of fighters during training for safety reasons. Boxers are not allowed to be too heavy going into WBC-sanctioned bouts. Rubio holds the WBC’s interim middleweight title.

Both Golovkin (30-0, 27 knockouts), THE RING’s No. 1-rated middleweight, and Rubio (59-6, 51 KOs), the magazine’s No. 8-rated contender, weighed within the prescribed limits set forth by the WBC rules.

“Both fighters look to be in excellent shape and will be well prepared on Oct. 18,” Tom Loeffler of K2 Promotions, which promotes Golovkin, stated in a press releast sent out on Monday.

Golovkin is currently training with Abel Sanchez at The Summit High Altitude Training Facility in Big Bear Lake, California, while Rubio is in Oxnard, California, with Robert Garcia at the Robert Garcia Boxing Academy.

The co-feature bout on Oct. 18 is a featherweight showdown between WBA titleholder Nonito Donaire (33-2, 21KOs) and undefeated puncher Nicholas Walters (24-0, 20 KOs). Walters is THE RING’s No. 3-rated featherweight; Donaire is rated No. 4 in the magazine’s 126 pound-rankings.

Both world title bouts will be televised live on HBO’s “World Championship Boxing^” beginning at 10:00 p.m. ET/PT.