[1] His first sport was tennis as he had the chance to watch the Australian Open and grew up idolizing former champion Michael Chang.

Expectations in his first year were that his team would be rebuilding, especially after San Sebastian lost its stars Calvin Abueva, Ian Sangalang, and Ronald Pascual.

[4] He got his first college career win in Season 89 against the Arellano Chiefs with a double-double of 10 points and 14 rebounds.

[8] In Season 90, Guinto contributed 14 points and 12 rebounds in a win over the JRU Heavy Bombers that gave his team an early solo lead in the standings.

After losing their first game of Season 91, he had 17 points, 20 rebounds, four assists, two steals, and two blocks as the Stags rallied to beat the Bombers.

[18] He also lost Defensive Player of the Year to Allwell Oraeme, but made the All-Defensive team.

[20] He had 17 points on 7-of-9 shooting, 13 boards, three blocks, one steal, and one assist in 33 minutes in a 101–97 loss to the Talk ‘N Text Tropang Texters.

[24] On November 8, 2016, Guinto, along with Chito Jaime, was traded to the NLEX Road Warriors for Rob Reyes, Jeckster Apinan, and Reden Celda.

[33] On January 20, 2021, he was traded to the Rain or Shine Elasto Painters for Sidney Onwubere and Clint Doliguez.

[38] As of the end of 2023–24 season[39] Guinto has a younger brother Jerwyn, who played for San Sebastian's Team B and the Lyceum Pirates.