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WBO middleweight titleholder Gennady Golovkin weighed in at 159 pounds and challenger Marco Antonio Rubio tipped the scale at 161.8 pounds for Saturday’s matchup at StubHub Center in Carson, Calif.

Rubio, 1.8 pounds over the limit, was given two hours to make 160. RingTv.com will provide updates as the situation develops.

Golovkin (30-0, 27 knockouts) is on a 17-fight knockout streak and is widely seen as boxing’s most feared puncher, but Rubio’s record (59-6-1, 51 KOs) is evidence of his own heavy hands and the Mexican veteran believes his experience will be the difference.

Disrupting Golovkin’s rise as one of boxing’s biggest attractions would represent a major upset, however. The 34-year-old Rubio’s last fight was a tenth-round knockout of Domenico Spada, who only rarely had fought outside the borders of Italy. Golovkin, meanwhile, has easily handled a string of solid contenders, though he has yet to face a truly elite opponent. The assumption is that the big-name fights (against the likes of Miguel Cotto, Julio Cesar Chavez Jr. or Andre Ward) lie just beyond Rubio.

For the main undercard attraction, defending WBA featherweight titleholder Nonito Donaire (33-2, 21 KOs) was 125.6 pounds and challenger Nicholas Walters (24-0, 20 KOs) also was 125.6 pounds.

Donaire has previously held world titles at 112, 118 and 122 pounds and is making the first defense of the title he took from Simpiwe Vetyeka in May. The up-and-coming Walters, of Jamaica, was last in the ring for a fifth-round knockout of former two-division titleholder Vic Darchinyan.

The fight card will be broadcast on HBO starting at 10 p.m. ET.

Full results

Gennady Golovkin (159) vs. Marco Antonio Rubio (161.8)

Nonito Donaire (125.6) vs. Nicholas Walters (125.6)

Edwin Rodriguez (174.8) vs. Azea Augustama (175.8)

Marcos Reyes (160.8) vs. Abraham Han (160.4)

Jaime Ocegueda (139.6) vs. Moris Rodriguez (138.8)

Walter Sarnoi (123.4) vs. Sergio Najera (125.2)

Ruslan Madiev (136.6) vs. Oscar Rojas (135)