Borciani started racing in the Italian Sport Production Championship, gaining eighth place in 1994, and fourth in 1995. He then moved to the Italian Honda GP 125 championship in 1996, while still continuing with rounds of the Sport Production series.

In 1997 he debuted in the European 125cc Championship, and took part in the final round of the 125 cc World Championship. Throughout the 1998 season he competed for the European 125 cc title against Marco Melandri, but after an accident and resultant damage to his hand, his season ended early with three rounds to complete.

In 1999 he raced in the World Supersport Championship, competing on a Honda CBR600F4, gaining a single point at the Nürburgring.

From 2000 to 2007, he competed in the Superbike World Championship:

From the 2003 season, he also raced in part of the Italian-national CIV Superbike championship, coming tenth in both 2003 and 2004. He returned to CIV Superbike from the 2006 season, joining the works Ducati team for two seasons.

In the 2005 season, Borciani had started his own BRC Racing team, managing other riders competing in series from junior Italian-based series, through WSBK and Superstock.

Having been released from the CIV Superbike Ducati-works team, he raced his own privateer Ducati in the 2008 series coming eighth, and the 2009 series, coming fourth.

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