We've already seen the debuts of top prospects like Julio Urias, Jameson Taillon and, most recently, Wilson Contreras. Here is a list of prospects who could boost their teams' chances of making the playoffs...and possibly winning the World Series.
Lucas Giolito, starting pitcher (Nationals)
Considered by many to be the top prospect in all of baseball, Giolito has the size (at 6'6") and the mid-to-upper 90s fastball to dominate at the next level. His secondary pitches have improved significantly as he has gone through the minor leagues, especially his 12-6 curve ball. Right now the Nationals do not need much help with their starting rotation, but the bullpen has been shaky at best. Adding him later in the season to help stabilize the back end of bullpen and conserve his innings could be huge benefit this season and later in his career.
Projected arrival to big leagues: September 1st
Tyler Glasnow, starting pitcher (Pirates)
Between Glasnow and Jameson Taillon, the Pirates have two extremely talented pitchers. Taillon made his debut on June 8th, and it's only a matter of time before we see Glasnow. At 6'8" Glasnow is similar to Giolito in that he has heat on his fastballs. Control has always been his biggest issue, but he's made significant strides in that area. The Pirates' rotation is not impressive by any means, and the team has struggled up to this point of the season. Seeing Glasnow push a player like Juan Nicasio or Jeff Locke out of the rotation soon wouldn't be surprising.
Projected arrival to big leagues: July 4th
Trea Turner, second baseman (Nationals)
Having already had a short call up earlier in the season for three games in June, Turner technically should not be on this list, but he has not played enough to keep him off. Turner has been held back by the Nationals but there isn't any reason why he shouldn't have been on the team already. He hits for average and has stolen 22 bases in 24 attempts. Right now Danny Espinosa is not doing much at second base, so Turner should and could be called up either today, tomorrow or not until September when roster is expanded.
Projected big league arrival: September 1st
Alex Reyes, Starting Pitcher (Cardinals)
Reyes tested positive during the off season and began the season serving a 50-game suspension for a second positive test in violation of the Minor League Drug Prevention and Treatment Program. When the season began he only needed to serve 40 of those games after sitting out 10 for the Arizona Fall league. Reyes is now back, and he started and pitched in 6 games for the Cardinals Triple-A affiliate in Memphis. He has 45 Strikeouts and just 13 walks in 26 innings pitched. His ERA is at 3.46 for the season. The 21-year-old is likely to find his way into the big leagues either in the bullpen or as a starter soon. Since he served the suspension to begin the season, Reyes will likely not need an innings limit and could factor into the team's starting rotation, especially if the oft-injured Jaime Garcia does not stay healthy.
Projected big league arrival: August 5th
A.J. Reed, first baseman (Astros)
Reed hit 34 homers and had a .346 and .332 average last year splitting time between High-A ball and Double-A, but he began this season slumping and injured at times. A big lefty with pop, there is no doubt he will hit right-handed pitching, but the question is can he be an everyday guy? Reed should be up with the Astros any day, according to reports, but the Astros' management wants to make sure he can contribute right away and not be forced into a platoon. He has bounced back recently at Triple-A by hitting .262 for the season, so Reed could be in for a call-up soon.
Projected big league arrival: July 1st
Josh Bell, first baseman (Pirates)
Right now the Pirates have been using a combination of John Jaso and David Freese at first base. Not exactly the greatest combination—and the Pirates are under .500 at the moment. The alternative would be to promote the 23-year-old Bell, who is a former second round pick from 2011. Bell has never hit for power as evidenced by his not hitting more than 9 home runs in any minor league season until this one (currently at 11). Bell has always hit for average and has been a consistent .300-and-above hitter in the past three minor league seasons. He has also improved his defense, which has always been a question for the former outfielder.
Projected big league arrival: July 31st
Yoan Moncado, second baseman (Red Sox)
Let's be clear here: Moncada is probably not debuting for Red Sox this season, barring injuries. I still wanted to put him on the list, because there is know doubt how special of a talent this kid is gonna be. Moncada just made his debut for Double-A Portland at the age of 21. The Cuban sensation should be with the team at some point next season, but what's most impressive with him is his overall skill set. Whether it is his fielding, speed or approach at the plate, Moncada is an absolute beast. The one thing about his game that we have not seen yet is his power. At 6'2" and 205, there is for sure potential for him to become a power hitter. Like I said, we probably won't see Moncada this season, but man it would be exciting if the Red Sox called him up in September.
Projected big league arrival: Playoffs this year? Most likely next season in the summer.
Alex Bregman, shortstop/third base (Astros)
A talented prospect out of LSU, Bregman has made the most of his short minor league career. Currently at Double-A, there has been a lot of talk about the Astros promoting Bregman to the majors to play third base even though he is a shortstop. Luis Valbuena has seen most of the playing time at third, but he is best suited to be a platoon player rather than an everyday. Bregman has 14 home runs, 44 RBI's and is hitting .302 right now in Double-A. The Astros, who struggled out of the gate, have slowly climbed back into the wild card race in the American League, so there doesn't seem to be any rush to promote Bregman until later in the season.
Projected big league arrival: September 1st
Clint Frazier, outfield (Indians)
The fifth pick in 2013 draft, Frazier was one of the top high school players in the draft. Now three years into his minor league career, the Indians may be forced to call-up Frazier because of all the injuries and suspensions that the team has had to deal with. Marlon Byrd is suspended for the season, Michael Brantley has dealt with shoulder problems and his return is not known, and the current outfield doesn't have much to offer outside of speed. Frazier is hitting .299 with 8 home runs right now for Double-A Akron, so seeing him promoted to Triple-A would not be surprising. The Indians want to compete right now, and seeing Frazier in the big leagues would be exciting.
Projected big league arrival: August 15th
Jose De Leon, starting pitcher (Dodgers)
The Dodgers are going to spend their money and assets to keep them in contention for the playoffs. Seeing De Leon in another uniform would not be surprising if the Dodgers use him as a trade chip. If the Dodgers decide to keep De Leon, then he could factor into the rotation soon. He spent some time on the DL with shoulder soreness, but has recently returned to the rotation for Triple-A where he has started four games and has 24 strikeouts. As I said, the Dodgers more than likely will go out and trade for a starting pitcher with experience, but I would love to see them give De Leon a shot at the big leagues soon.
Projected big league arrival: July 20th