Team India fast bowler Navdeep Saini, who slammed 45 runs off 49 deliveries against New Zealand in the second ODI, has said that Kiwi batsman Martin Guptill is a "challenge" for him. Guptill scored 79 runs, including eight 4s and three 6s, in the match. New Zealand have won the first two ODIs with the last one scheduled on Tuesday.