The daughter of Invincible Spirit has run consistently well this season and deserved this third career win.
She was settled towards the rear by Andrea Atzeni. The field were taken along at a decent tempo by Floating Along, which suited Tantshi as she often races keenly.
Andrea made progress, making his challenge towards the outside with a furlong to run. The Godolphin runner Ghananian burst through to lead but Andrea had her in his sights and Tantshi picked up well hit the front and held off that rival by a neck.
Roger said: "She is quite a talented filly when it all falls right for her. Her form is strong and it was good to get her head in front again."
Tantshi (far side) works on the watered gallop under Mick Denaro