The project also marked the beginning of an association with Dhanush, whom Sivakarthikeyan has often stated is his mentor in the film industry. Following significant pre-release hype, the film opened to predominantly positive reviews with critics appreciating Sivakarthikeyan's work providing comic relief in a serious film. Prior to Marina's release, Aishwarya Dhanush had signed him up to play a supporting role as Dhanush's friend in 3, after being impressed with his work on stage as a host. Featuring alongside Oviya as a young couple in the film, Siva's performance was well received with a critic noting "the romance adds color to a monochrome film", while the reviewer also noted that the "role of Senthilnathan requires Siva to be just himself, it is just a cake walk in terms of performance for this actor." He prepared for his first role by paying close attention to Pandiraj's instructions and visiting Marina Beach extensively to study the surroundings, while revealing that he hoped that his natural talent of humor would come through on-screen. The makers of Aegan noticed Sivakarthikeyan and offered him a supporting role, but his portions didn't make the final cut.ĭirector Pandiraj approached him to play the lead role in his film Marina, and Sivakarthikeyan signed the project.
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He appeared in short films including his friend Atlee's Mugapputhagam, Identity, Kurahl 786 and 360°. Despite initial reluctance to participate, he won the show.
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He started his career as a mimicry artist. Between his studies he took three months break and during this period his friends convinced him to go for auditions of Kalakka Povathu Yaaru, a reality show for comedy aired on Star Vijay. During college, Sivakarthikeyan took part in various cultural events and performed mimicry and stand-up comedy on stage.