As Memorial Day approaches, the MLB trade rumor season is beginning to gain clarity, with the July 31 trade deadline drawing near. Recognizing this trend, Moneyline has developed a BS Meter with four settings—non-existent, low, medium, and high—to gauge the credibility of various trade speculations. This measure aims to offer fans insight into which rumors might hold weight and lead to actual moves.

One noteworthy rumor comes from Mark Feinsand of MLB.com, who reported that the Philadelphia Phillies made preliminary contact with relief pitcher David Robertson before José Alvarado’s recent 80-game suspension due to performance-enhancing drugs. Though Feinsand noted that 'no serious talks took place,' the interest is understandable. The Phillies were likely seeking bullpen reinforcements even before losing Alvarado, and Robertson, a veteran who represents himself, fits the bill. While a deal does not appear imminent, Robertson boasts a respectable 3.00 ERA and 2.65 FIP from his previous season with the Texas Rangers, leading to questions about why he remains unsigned at this late stage.

Another rumor highlighted by Bob Nightengale of USA Today suggests that the Los Angeles Dodgers and Chicago Cubs are 'closely monitoring' infielder Ryan McMahon, potentially as the Colorado Rockies consider trade opportunities. The Rockies have historically been hesitant to sell major pieces, and despite their current struggles, owner Dick Monfort and general manager Bill Schmidt may remain reluctant to alter their strategy. McMahon's performance this season has been underwhelming, evidenced by a .211 batting average and .706 OPS. Although he has been a strong defensive asset at third base, potential trade partners may be dissuaded by his hefty $32 million salary commitment between 2026 and 2027, especially given his current struggles at the plate. While the Rockies could facilitate a trade if they cover some of McMahon's salary, they may ultimately choose to retain him as one of their few marquee players.

In a contrasting rumor, Jon Heyman expressed in a recent stream that there is 'no way, no how, no chance' the Pittsburgh Pirates would consider trading young pitcher Paul Skenes. Despite the Pirates' challenging season, trading a player of Skenes' caliber seems unlikely, especially given his age and impressive early-career statistics, including a 2.12 ERA over his first 33 MLB starts. Such generational talent should be the focal point for a rebuilding team like the Pirates, as Skenes could be key to their future success.

Moreover, Nightengale also offered his opinion that Rhys Hoskins might be an ideal fit for the Boston Red Sox should the Milwaukee Brewers decide to trade him. While this is not a formal report, Hoskins’ power-hitting ability could thrive at Fenway Park. The Brewers still find themselves in contention, albeit with a modest 24-26 record, making it uncertain whether they will opt to sell. However, their previous willingness to part with veterans like Josh Hader during competitive seasons hints that Hoskins may not be off the table, particularly if he continues to perform well following an ACL injury that limited him last season. Given his .902 OPS this year, the Brewers may consider trading Hoskins to acquire prospects while managing financial commitments related to his potential buyout.

Lastly, Jon Heyman noted that trading Luis Robert Jr. would not be likely if his performance continues to lag, especially if he remains under .200. Robert, who previously showcased a promising contract and strong statistical output, is currently batting .210 with a .630 OPS. His recent struggles, compounded by injury history, could lead teams to view him merely as a rental. Given his peripheral performance metrics, teams would likely be hesitant to part with top prospects for a player whose future remains uncertain.