Every year, there are prospects fantasy owners draft then stash, taking up a valuable roster spot in hopes their big league debut will take place sooner rather than later.

The Mariners this week decided now was the time to make that call. They called up their biggest prospect: Logan Gilbert, who stands at 6-foot-6.

You thought Roto Rage was talking about Jarred Kelenic (the stud prospect who helped the Mets land franchise-changers Edwin Diaz and Robinson Cano), didn’t you? Yeah, he was called up, too, and went 0-for-4 in his debut and then homered and drove in three the next night. But let’s focus on the guy whose name won’t give Mets fans agita every time it’s uttered for the next decade or so.

After making one start at Triple-A (1-0, 1.80 ERA, five Ks), Gilbert was promoted and made his first start against the Indians on Thursday.

It wasn’t the prettiest debut. Gilbert took the loss, allowing four earned runs over four innings with five strikeouts. He allowed seven hard-hit balls on 13 batted-balls (two of which were homers).

A loss and a 9.00 ERA look bad on the surface, but it’s one start — and one fantasy owners can learn from.

The 24-year-old relied heavily on his fastball, with his four-seamer accounting for 60.6 percent of his 71 pitches. He had a 9.3 percent whiff rate and allowed opponents to hit .500 with three singles and a home run against the pitch, which had an average velocity of 94.7 mph. Even with his velocity topping out at 97 mph, he had an exit velocity of 93.2 mph on eight batted balls (again, not everything is good news).

Gilbert did have success with his slider. Despite giving up a home run (the only hit he allowed with his slider) with a 91.8 mph exit velocity, opponents hit .111 with a 29.4 swing-and-miss rate against the pitch. All five of his strikeouts came via the slider.

Other reasons to be optimistic: Gilbert’s full repertoire was not on display. He threw 17 sliders, 11 curveballs and not a single changeup. Why is this good news? He hasn’t shown all his cards. Using all of his secondary pitches, and relying less on his fastball, should benefit him going forward.

Gilbert also had command of his pitches, not walking a single batter. Of his 71 pitches, 52 were thrown for strikes (13 percent were strikes looking, and 14.1 percent were swinging strikes). He only had one full count, and he wound up with a strikeout in that at-bat.

The numbers from his debut might not look pretty, but this is a kid who has had overwhelming success at every level. There is a reason he was one of the top 35 prospects in baseball, according to Baseball America, heading into the season.

Over three seasons at Stetson University (the same school that produced Jacob deGrom and Corey Kluber), Gilbert was 23-3 with a 2.48 ERA, a 1.029 WHIP, 11.2 strikeouts per nine and 2.8 walks per nine.

In 26 starts at Single-A, High-A and Double-A in 2019, he was 10-5 with a 2.13 ERA, 165 strikeouts (11.0 per nine innings) and a 0.948 WHIP. He struck out 31.5 percent of the batters he faced, while walking just 6.3 percent.

Over all levels (college included) prior to Thursday, Gilbert was 35-10 with a 2.30 ERA, 0.991 WHIP, 11.0 strikeouts per nine and 2.5 walks per nine.

As of Friday, Gilbert was the second-most added starting pitcher (fifth-most added overall), but remained available in more than 65 percent of ESPN leagues. He has all the tools needed to succeed in the majors, it just may take a minute for the youngster to figure out how to use them. Roto Rage believes he is worth adding and keeping on your bench until that time comes.

Brandon Woodruff SP, Brewers

Has not allowed more than two earned runs in his past seven starts, going 2-1 with a 1.19 ERA, 56 strikeouts and a .120 opponent average.

Robbie Grossman OF, Tigers

In his first 10 games this month, he was 12-for-39 (.308) with one homer, 10 RBIs, eight walks to just five whiffs, three stolen bases and a .967 OPS.

Taijuan Walker SP, Mets

Saw his ERA go from 3.21 on April 20 to 2.20 after going 3-0 with a 1.67 ERA, 20 strikeouts and a .161 opponent average over his past four starts.

Josh Rojas 2B/3B/OF, Diamondbacks

Despite having an 11-game hit streak snapped Thursday, he was 23-for-61 (.406) with four homers, 10 RBIs, 15 runs, two stolen bases and a 1.095 OPS over his previous 17 games before Friday.

Luis Castillo SP, Reds

Has lost four straight decisions, allowing 21 runs (19 earned) over 18 innings (9.50 ERA). Opponents are hitting .372 against him in that span.

Eduardo Escobar 2B/3B, Diamondbacks

Hit .253 with seven homers and 16 RBIs in April, but had four hits in his first 43 at-bats this month (.093). He struck out 14 times in that span.

Lourdes Gurriel Jr. OF, Blue Jays

Over his first 12 games this month, the struggling 27-year-old was 7-for-47 (.149) with three RBIs, nine strikeouts and .359 OPS.

Blake Snell SP, Padres

The 2018 Cy Young winner is striking out 12.8 per nine, but he is walking a career-worst 6.3 per nine. Has pitched into the sixth inning just once, has one win and a 4.85 ERA over his past seven starts.

Bohm Squad