I recently discovered the work Gian Galang, a designer and illustrator based out of New York City, and was completely blown away with his illustrative style. He is a big fan of MMA and majority of his artwork is influenced by the sport. His pieces are a mix of acrylic and digital so in my eyes, he's a "Mixed Media Artist".
I'm a big fan of his use of black and white with minimal additions of color. Combined with rough textures and paint splatters, the work really conveys the the blood and sweat that comes with the sport.