George Ford kicked all 18 points as Bath won at Franklin's Gardens for the first time in 16 year's
Two Nic Groom tries for Saints in the final few minutes made it closer than it should have been
Bath and Wales back-rower Taulupe Faletau left the field injured in the first half
Bath staved off a late fightback from Northampton before claiming a hard-fought 18-14 victory at Franklin's Gardens on Saturday.
Fly-half George Ford, whose father Mike was replaced by Todd Blackadder, scored all of the visitors points - four penalties and two drop goals - while Saints fly-half Harry Mallinder left his kicking boots at home, missing two penalties.
South African Nic Groom scored two late tries for Saints on his debut to rescue the hosts a losing bonus-point on, but Bath held on for a famous victory.
Nevertheless, the famous win was slightly dampened as Wales back row Taulupe Faletau left the field with injury early on his debut.
Bath Rugby: George Ford
Northampton Saints: 15 Ben Foden, 14 Ken Pisi, 13 George Pisi, 12 Luther Burrell, 11 Ahsee Tuala, 10 Harry Mallinder, 9 Lee Dickson, 8 Louis Picamoles, 7 Jamie Gibson, 6 Tom Wood (c), 5 Michael Paterson, 4 Courtney Lawes, 3 Kieran Brookes, 2 Dylan Hartley, 1 Alex Waller
Replacements: 16 Charlie Clare, 17 Campese Ma’afu, 18 Paul Hill, 19 Sam Dickinson, 20 Teimana Harrison, 21 Nic Groom, 22 Stephen Myler, 23 George North
Bath: 15 Tom Homer, 14 Semesa Rokoduguni, 13 Jonathan Joseph, 12 Max Clark, 11 Matt Banahan, 10 George Ford, 9 Kahn Fotuali’i, 8 Taulupe Faletau, 7 David Denton, 6 Matt Garvey (c), 5 Dave Attwood, 4 Charlie Ewels, 3 Henry Thomas, 2 Ross Batty, 1 Nathan Catt
Replacements: 16 Tom Dunn, 17 Nick Auterac, 18 Kane Palma-Newport, 19 David Sisi, 20 Tom Ellis, 21 Chris Cook, 22 Rhys Priestland, 23 Jeff Williams
Date: Saturday, September 3
Venue: Franklin's Gardens
Kick-off: 15:30 BST (14:30 GMT)
Referee: JP Doyle
Assistant Referees: Tim Wigglesworth, Ross Campbell
TMO: David Sainsbury