The West Country derby kicks-off the action on Friday evening © Getty Images

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Ahead of the weekend's Aviva Premiership action, ESPN brings you a rundown of the key stats relating to the Round Six matches.

Bath Rugby v Gloucester Rugby

Bath Rugby were victorious in their opening two Amlin Challenge Cup ties against Bordeaux-Begles and Newport Gwent Dragons. Bath's last four matches in Aviva Premiership Rugby have all been won by the home side on the day, whilst they have a 100% winning record in the Premiership at The Rec in 2013.

Gloucester Rugby's most recent Premiership encounter ended in a 12-29 defeat at home to Exeter Chiefs. Gloucester's only victory in their last seven away matches in all competitions was 22-16 at Newcastle Falcons in round four of the Premiership.

Bath have won their last two fixtures with Gloucester in all tournaments whilst Gloucester's recent record at The Rec is a creditable won three, lost two.

Exeter Chiefs v Worcester Warriors

Exeter Chiefs' solo defeat in their last four Aviva Premiership Rugby encounters was 9-21 at home to Leicester in round four. This remains the Chiefs only loss at Sandy Park in any tournament since March.

Worcester Warriors have not won a game in any competition since London Wasps visited Sixways on March 1. The Warriors have won only one of their last 35 away games in the Premiership since April 2009: 6-0 at Wasps on New Year's Day 2012.

Exeter have won all four previous fixtures with Worcester in the Premiership, whilst the Warriors most recent triumph in Exeter came at the old County Ground in National League One in March 2004.

Harlequins v Sale Sharks

Harlequins have slipped to four straight defeats in all competitions since their victory at Worcester in Aviva Premiership Rugby on September 20. The Londoners have lost successive matches in the Premiership at the Twickenham Stoop but have not been defeated in three consecutive games in the tournament at the venue in the same season since they were relegated in season 2004-05.

Sale Sharks have won their last three encounters in all competitions against Bath, Biarritz and Worcester, and have won two of their last three away matches.

The last time the clubs faced each other was in the final of last season's Anglo-Welsh Cup which Harlequins won 32-14 at Worcester to record a seventh straight defeat of the northerners. Sale's most recent victory at The Stoop was 29-19 in the Amlin Challenge Cup in December 2009.

Northampton Saints v Saracens

Northampton Saints have won their last four games at Franklin's Gardens in all competitions since Leicester Tigers won there in March. The Saints have lost just one Aviva Premiership Rugby game this season: 24-26 at Gloucester in round three.

Saracens' nail biting 16-17 loss to Toulouse at Wembley on Saturday was their first defeat since last season's Premiership semi-final, against Northampton. Sarries have lost only once away from home in the Premiership since early February: 23-28 at Gloucester in April.

The Saints' victory at Allianz Park in May ended a three game losing run to Saracens, including a 16-6 victory on their most recent visit to Franklin's Gardens a day short of 12 months ago.

London Wasps v Leicester Tigers

London Wasps have won three of their last four matches in all competitions, but in Aviva Premiership Rugby the Londoners have managed only one win in their last twelve games: 32-16 at home to Worcester in round four.

Leicester Tigers have lost just once in the Premiership since April: 27-20 at Bath in round two. The Tigers have tallied at least one league point from every game in the competition since round four last season.

The last 10 encounters between the two clubs since September 2008 have all been won by the home side on the day, whilst Leicester have not been victorious at Adams Park since September 30 2007.

Newcastle Falcons v London Irish

Newcastle Falcons won their most recent Aviva Premiership Rugby fixture, 16-11 at Worcester on October 5, a second victory in the tournament since they were promoted at the end of last season. The Tynesiders have lost their last three Premiership encounters played at Kingston Park, since they beat Sale Sharks there, 22-19, in March 2012.

London Irish have recorded three straight victories in all competitions against Harlequins, Italian side Prato and Portuguese outfit Lucitanos. The Exiles only victory away from home in their last six trips in the Premiership was 20-18 at Worcester in round two.

Newcastle's 19-10 win in February 2012 was their first over London Irish in six encounters. The Irishmen's only victory at Kingston Park since 2008 was 46-12 in the Premiership in September 2010.

Stuart Farmer Media Services for Premier Rugby