Nataraj Behera and Sandeep Mulia scored a century each to guide host Orissa to 358 for five in the first innings on the opening day of their four-day C K Nayudu Trophy under-22 cricket match against Sikkim at Nimpur ground in Cuttack today. Brief scores: Orissa 358/5 in 93 overs (Sandeep Mulia 128, Natraj Behera 115, Rajesh Sethy 40: Shailendra Tomar 2/33).