The 2018 Castello di Fonterutoli Siepi IGT is a proprietary blend from Tuscany, Italy, produced by Mazzei Castello di Fonterutoli. This red wine, featuring a 14.5% alcohol content and sealed with a cork, is a blend of Merlot and Sangiovese, showcasing an exemplary balance of these varietals.

James Suckling awarded this wine an impressive 97 points, describing it as "extremely perfumed and crystal-clear with violets, plums, raspberries, walnuts and black olives." He noted its "medium-to full-bodied" nature with "very fine tannins that are extremely polished and refined" and emphasized its "long and very precise" length. Suckling highlighted the wine's anniversary significance, stating, "This is the 25th anniversary of this fine Merlot and Sangiovese."

Similarly, Vinous also rated the wine at 97 points. Antonio Galloni praised the 2018 Siepi for being "rich, pliant and creamy," offering "all of the seductiveness of Merlot with the bright acids and grip of Sangiovese." He highlighted the wine's "inky blue/purplish fruit, lavender, dried herbs, spice, licorice and new leather" and credited the blend's success to the "alberese soils with a good bit of clay." Galloni concluded, "The 2018 is an undeniably sexy wine with so much immediacy," and deemed it "positively stellar."

Decanter provided a score of 95 points, appreciating the wine's "sweetness that is enveloping and seductive with baked earth undertones set against raspberry, plum, black cherry and sandalwood." The review noted the wine’s "soft and caressing tannins" and the "satiny texture and enveloping mouthfeel" contributed by the Merlot. Decanter also highlighted the estate's commitment to sustainability, noting its positive carbon balance.

Robert Parker's Wine Advocate, also scoring the wine at 95 points, emphasized its "extremely linear and focused" nature with a "pretty mineral signature." Monica Larner pointed out the complementary qualities of Merlot and Sangiovese, calling it "one of their most 'gastronomic' or food-friendly vintages of Siepi."

Wine Spectator rated the wine at 94 points, describing it as having "black currant, black cherry and cedar aromas and flavors" with a "supple texture and integrated structure." The review acknowledged its readiness for immediate enjoyment while also possessing the structure to age well.

Overall, the 2018 Castello di Fonterutoli Siepi IGT is a highly acclaimed wine, celebrated for its balance, complexity, and aging potential.