Xavier Isaac

20-Year-Old First Baseman1B
Tampa Bay Rays AA
2025 Fantasy Outlook
Isaac looks the part of a franchise first baseman in the making, and his track record of performance is very strong, but a late-season spike in strikeouts has increased his perceived volatility in dynasty leagues. Isaac slashed .310/.395/.579 with 12 home runs, 13 steals and a 27.6 percent strikeout rate in his first 54 games for High-A Bowling Green before missing two weeks with an undisclosed injury. After returning in late June, Isaac slashed .213/.339/.372 with seven home runs, three steals and a 41 percent strikeout rate over the final 53 games of his season, which included 31 games at Double-A after an early-August promotion. He made up for the lost time with a .957 OPS, three homers and a 40.3 percent strikeout rate in 15 Arizona Fall League games. He's a big guy (6-foot-3, 240 pounds), but Isaac happens to be 27-for-30 on stolen-base attempts in 209 games, so he could flirt with double-digit steals early in his big-league career. If Isaac's 2024 strikeout issues quickly start to look like an outlier, he'll surge back up prospect rankings, but if he looks like the same whiff-happy hitter early in 2025, he'll fall outside the top 50. We advise buying low, as Isaac still has a very high ceiling with youth and strong makeup on his side. He turns 21 this offseason and will return to Double-A to start the year. Read Past Outlooks
RANKS
Rest of Season From Preseason
$Signed a contract with the Rays in July of 2022.
Moved up to Double-A
1BTampa Bay Rays  AA
August 2, 2024
The Rays promoted Isaac from High-A Bowling Green to Double-A Montgomery on Friday.
ANALYSIS
Isaac won't turn 21 years old until December but has already reached the Double-A level after slashing .288/.380/.537 with 15 home runs and 14 stolen bases over 70 games with Bowling Green. He is arguably the top first base prospect in all of baseball.
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Recent RotoWire Articles Featuring Xavier Isaac See More
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Past Fantasy Outlooks
2024
2023
Isaac is a rare premium first base prospect. Most of the best fantasy first basemen were underrated as prospects (Paul Goldschmidt, Pete Alonso) or came up at other positions (Bryce Harper, Vladimir Guerrero), but the Rays selected Isaac out of high school with the No. 29 overall pick in 2022 knowing full well he'd be splitting time between first base and designated hitter. The 6-foot-4, 240-pound lefty slugger has huge raw power, but he didn't sell out for it in his first full pro season, logging a 21 percent strikeout rate at Single-A and at High-A. His walk rate was eerily consistent as well, (15% at Single-A, 14% at High-A). Anyone who doubted Isaac's game power got a swift lesson at the end of the year after he hit six home runs in 12 High-A games en route to a .490 ISO in that brief run as a 19-year-old. Isaac could be big-league ready in a year or two, and the main question is whether he will be platooned at the highest level. He had a .976 OPS and 20.1 K% in 339 plate appearances against righties and a .697 OPS and 25.5 K% in 94 plate appearances against southpaws.
Isaac wasn't high on many public draft boards, as he is a first base-only prep hitter who missed the 2021 showcase circuit due to a fractured foot. However, he has massive fantasy potential. The Rays shocked draft pundits by selecting Isaac with the 29th overall pick and giving him full slot money. The 6-foot-4, 240-pound lefty masher has as much raw power as any hitter in the class, which is saying something, and the Rays were probably more bullish on his hit tool than any other club. Isaac is a hard worker who is intent on proving the doubters wrong. He will head to Single-A for his first full season. The pressure will always be on him to hit, given his size and limited defensive value. But Isaac has the upside to be one of the best run producers in the game.
More Fantasy News
Returns to action for Bowling Green
1BTampa Bay Rays  AA
June 30, 2024
Isaac (undisclosed) has started in two of High-A Bowling Green's last three games against Asheville, going 0-for-8 with a walk and an RBI.
ANALYSIS
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Sidelined with undisclosed injury
1BTampa Bay Rays  AA
Undisclosed
June 26, 2024
Isaac has not played in a game for High-A Bowling Green since June 13 due to an undisclosed injury.
ANALYSIS
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Heating up for Hot Rods
1BTampa Bay Rays  AA
May 14, 2024
Isaac is slashing .257/.350/.495 with six home runs, five steals and a 27.4 percent strikeout rate through 28 games for High-A Bowling Green.
ANALYSIS
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Two homers in Spring Breakout game
1BTampa Bay Rays  AA
March 17, 2024
Isaac hit two home runs in Saturday's Spring Breakout game, an 8-8 tie against Minnesota, despite being limited to DH this spring due to a sore ankle, MLB.com reports. His second home run had an exit velocity of 110.4 mph.
ANALYSIS
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Mashes first High-A homer
1BTampa Bay Rays  AA
August 24, 2023
Isaac, who was promoted to High-A Bowling Green on Tuesday, hit his first home run at that level Thursday against Winston-Salem.
ANALYSIS
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