The Reds signed Marquez as a teenager after the 2011 season. He would spend 2012 in the Dominican Summer League as a 17-year-old where he posted a 5.64 ERA in 30.1 innings. The Reds brought Marquez stateside in 2013 and sent him to the Arizona League Reds to start the summer.
June began for the right hander as he threw 2 shutout innings out of the bullpen on the 21st with 2 strikeouts. He would fired 0.2 perfect innings on the 23rd against the Brewers before giving up 2 runs in an inning against the Dodgers on the 28th. The Venezuelan finished up the month with 1.1 shutout innings to finish up the month with a 3.60 ERA in 5 innings with no walks and 3 strikeouts.
July saw Marquez get off to an outstanding start as he fired 9.1 shutout innings with 8 strikeouts from the 1st through 18th, including two separate outings that lasted at least 3 innings. On the 18th he allowed just 1 hit with 5 strikeouts in 3 innings. On the 23rd he allowed his first runs of the month with 2 earned in 4 innings with a walk and 4 strikeouts. In his next and final outing of July the right hander allowed 2 runs in 3 innings with a walk and 3 strikeouts. His July finished up with 16.2 innings pitched, a 2.20 ERA, 0.80 WHIP and 15 strikeouts with just 5 walks.
For as good as July was, August was a struggle. The first outing went well as Marquez allowed 1 earned in 2.2 innings with 2 walks and 2 strikeout. Over his next two outings though he would really struggle with his control as he walked 5 batters and allowed 7 runs in 3.2 innings with just one strikeout. He rebounded well for his game on the 18th where he allowed a run in 4.2 innings with a walk and 2 strikeouts but his final two games of the year were much like the two before his start on the 18th. He would allowed 7 earned in 4.2 innings with 3 walks and 2 strikeouts over the last two games to finish out August and his season. He finished the month with a 9.19 ERA in 15.2 innings with 11 walks and just 7 strikeouts. Control got away from him on the month and his strikeout rate plummeted, leading to an ERA jump from 2.53 coming into the month to 5.35 by the end of the month.
Season Stats
| W | L | ERA | SV | IP | H | HR | BB | K | WHIP | BB% | K% | K/BB |
| 2 | 1 | 5.45 | 0 | 36.1 | 34 | 3 | 16 | 25 | 1.38 | 9.9% | 15.5% | 1.6 |
Overall Thoughts
Marquez was very impressive over the first 5 weeks of his season with a 2.53 ERA in 21.1 innings with just 5 walks and 18 strikeouts. His August was a disaster though as his good control prior to the month simply fell apart and he began walking hitters at a very high rate. He was used most of the season every five days, perhaps showing that he is still being considered as a starting pitcher in the future. I would expect to see him in Billings next season where hopefully he can avoid the late season breakdown that he saw this past season.
For more player season review, you can see the entire list here.