Using a melon baller, scoop at least 4 balls of watermelon, skewer 2 watermelon balls each on 2 cocktail picks and place in an ice cube tray. Freeze for 1 ½ - 2 hours.
Add 5 - 6 mint leaves to a cocktail shaker and muddle to release the oils for maximum flavor. Add Master of Mixes Watermelon Daiquiri/Margarita Mixer, lime juice and vodka to the shaker and fill with ice. Shake well for about 30 seconds.
Pour into ice-filled glasses. Garnish with frozen watermelon balls and a sprig of mint.