Can Bu pull off the upset of the tournament?

Standings after 7 rounds:

1 Ivanchuk Vassily 2740 UKR 6,0
2 Topalov Veselin 2767 BUL 5,0
3 Cheparinov Ivan 2695 BUL 3,5
4 Radjabov Teimour 2751 AZE 3,5
5 Aronian Levon 2763 ARM 2,0
6 Bu Xiangzhi 2708 CHN 1,0

Round 8 matchups:

Topalov, V – Cheparinov, I
Aronian, L – Radjabov, T
Xiangzhi, Bu – Ivanchuk, V

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