The Deans, who had scored 30 goals in winning their opening five games, were held 1-1 at Five Heads Park.
Horndean are six points clear of second-placed Moneyfields, while US remain unbeaten after five games, drawing three of them.
1. Max Innalls (21), and Toby Toman on the ball. Horndean v US Portsmouth U18s, Hampshire Combination LeaguePicture: Chris Moorhouse (111020-31)
Max Innalls (21) about to challenge Toby Toman. Picture: Chris Moorhouse Photo: Chris Moorhouse
2. Max Innalls, left, and Toby Toman. Horndean v US Portsmouth U18s, Hampshire Combination League Picture: Chris Moorhouse (111020-30)
Max Innalls, left, and Toby Toman challenge for a header. Picture: Chris Moorhouse Photo: Chris Moorhouse
3. Toby Toman, right. Horndean v US Portsmouth U18s, Hampshire Combination League Picture: Chris Moorhouse (111020-29)
US Portsmouth's Toby Toman. Picture: Chris Moorhouse Photo: Chris Moorhouse
4. Toby Toman, right, shoots over. Horndean v US Portsmouth U18s, Hampshire Combination League Picture: Chris Moorhouse (111020-28)
Toby Toman, right, fires over the bar during US Portsmouth's 1-1 draw at Horndean in the Hampshire Development League. Picture: Chris Moorhouse Photo: Chris Moorhouse
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