John Smit marked his Saracens debut with his first Heineken Cup try as he helped English champions Saracens notch a comfortable 42-17 bonus point start to their campaign.

The former Springbok skipper had tasted European action before during a short stay at Clermont Auvergne and he made a return to the tournament in the 58th minute as a replacement for fellow countryman Schalk Brits.

And it didn't take long for him to make an impact as he drove over for his side's fifth and final try in the 77th minute to round off a good day's work by the home pack.

But while Smit grabbed the headlines late in the day it was England prospect Owen Farrell who enhanced his growing reputation with a 22 point contribution with a try, four conversion and three penalties.

In fact, it was 16-3 to Farrell at the break and it wasn't until Britz put Dave Strettle over for a try six minutes into the second half with a delightful inside pass that Farrell's stranglehold o the scoreboard was broken.

Franco Smith's Benetton Treviso had won on the road in their domestic league at both Ulster and Glasgow this season, but found themselves outgunned upfront and outpaced behind. Even so, their defence never leaked and they hit back to score two tries in the final six minutes.

Replacement hooker Franco Sbaraglini got the first and then replacement lock Gonzalo Padro ensured a good ending with his 80th minute touchdown.

The bonus point victory took Saracens to the top of Pool 5 and they will travel to face Biarritz Olympique next weekend, while Benetton Treviso's second round assignment is at home against the Ospreys.

In Sundays other matches former Heineken Cup Champions Toulouse were made to work hard for an opening victory in this year's tournament, having to come from behind twice to beat a passionate Gloucester side.

The Cherry and Whites held the lead for long periods of the game, but clinical finishing from the hosts saw them claim a tight 21-17 victory.

Meanwhile, Glasgow Warriors snatched a late win over Bath at Firhill with lock Richie Gray scoring a try with the last play of the game to give his side a 26-21 victory.

The script looked set for Bath to come away with the win after debutant and World Cup winner Stephen Donald came off the bench to kick them ahead with four minutes remaining.

But Gray and the Warriors had the last word. Duncan Weir launched a drop-goal attempt with the clock showing red but his kick was way short and Bath failed to deal with the bouncing ball and Gray took his opportunity and divded under the posts to win the game.

Sunday's scores and scorers!

Saracens 42 Treviso 17

The scorers:

For Saracens:
Tries: Wyles, Strettle, Farrell, Joubert, Smit
Cons: Farrell 4
Pens: Farrell 3

Yellow card: Schalk Brits

For Treviso:
Tries: Sbaraglini, Padrò
Cons: De Waal 2
Pen: De Waal

Yellow card: Diego Vidal

The teams:

Saracens: 15 Chris Wyles, 14 David Strettle, 13 Owen Farrell, 12 Brad Barritt, 11 James Short, 10 Charlie Hodgson, 9 Neil de Kock, 8 Ernst Joubert, 7 Andy Saull, 6 Kelly Brown, 5 Hayden Smith, 4 Steve Borthwick, 3 Matt Stevens, 2 Schalk Brits, 1 Rhys Gill.
Replacements: 16 John Smit, 17 Deon Carstens, 18 Carlos Nieto, 19 George Kruis, 20 Justin Melck, 21 Ben Spencer, 22 Adam Powell, 23 Alex Goode.

Treviso: 15 Ludovico Nitoglia, 14 Benjamin de Jager, 13 Tommaso Benvenuti, 12 Alberto Sgarbi, 11 Brendan Williams, 10 Willem de Waal, 9 Fabio Semenzato, 8 Robert Barbieri, 7 Alessandro Zanni, 6 Benjamin Vermaak, 5 Cornelius van Zyl, 4 Antonio Pavanello, 3 Lorenzo Cittadini, 2 Diego Vidal, 1 Michele Rizzo.
Replacements: 16 Franco Sbaraglini, 17 Ignacio Fernandez Rouyet, 18 Pedro di Santo, 19 Valerio Bernabo, 20 Gonzalo Padrò, 21 Manoa Vosawai, 22 Kristopher Burton, 23 Tobias Botes.

Referee: John Lacey (Ireland)

Toulouse 21 Gloucester 17

The scorers:

For Toulouse:
Tries: Matanavou, Poitrenaud
Con: Beauxis
Pens: McAlister 2, Beauxis

For Gloucester:
Tries: Sharples, Trainer
Cons: Burns 2
Pen: Burns

Yellow card: Alasdair Strokosch

Teams:

Toulouse: 15 Clément Poitrenaud, 14 Timoci Matanavou, 13 Yann David, 12 Florian Fritz, 11 Yves Donguy, 10 Luke McAlister, 9 Luke Burgess, 8 Shaun Sowerby, 7 Sylvain Nicolas, 6 Yannick Nyanga, 5 Romain Millo-Chluski, 4 Yoann Maestri, 3 Census Johnston, 2 Gary Botha, 1 Jean-Baptiste Poux.
Replacements: 16 William Servat, 17 Yohan Montes, 18 Johnson Falefa, 19 Grégory Lamboley 20 Nicolas Vergallo, 21 Yannick Jauzion, 22 Lionel Beauxis, 23 Gillian Galan.

Gloucester: 15 Olly Morgan, 14 Charlie Sharples, 13 Henry Trinder, 12 Mike Tindall, 11 Tom Voyce, 10 Freddie Burns, 9 Rory Lawson, 8 Alasdair Strokosch, 7 Akapusi Qera, 6 Peter Buxton, 5 Jim Hamilton, 4 Will James, 3 Rupert Harden, 2 Darren Dawiduik, 1 Nick Wood.
Replacements: 16 Scott Lawson, 17 Dan Murphy, 18 Dario Chistolini, 19 Tom Savage, 20 Luke Narraway, 21 Dave Lewis, 22 Tim Taylor, 23 Jonny May.

Referee: Peter Fitzgibbon (Ireland)

Glasgow 26 Bath 21

The scorers:

For Glasgow:
Tries: Hogg, Gray
Cons: Weir 2
Pens: Weir 4

For Bath:
Pens: Heathcote 6, Donald

The teams:

Glasgow: 15 Stuart Hogg, 14 Tommy Seymour, 13 Rob Dewey, 12 Graeme Morrison, 11 Colin Shaw, 10 Duncan Weir, 9 Chris Cusiter, 8 Ryan Wilson, 7 John Barclay, 6 Rob Harley, 5 Alastair Kellock, 4 Richie Gray, 3 Michael Cusack, 2 Pat MacArthur, 1 Ryan Grant.
Replacements: 16 Dougie Hall, 17 Gordon Reid, 18 Ed Kalman, 19 Tom Ryder, 20 Chris Fusaro, 21 Henry Pyrgos, 22 Troy Nathan, 23 Federico Aramburu.

Bath: 15 Nick Abendanon, 14 Olly Woodburn, 13 Dan Hipkiss, 12 Matt Banahan, 11 Tom Biggs, 10 Tom Heathcote, 9 Michael Claassens, 8 Simon Taylor, 7 Guy Mercer, 6 Francois Louw, 5 Ryan Caldwell, 4 Stuart Hooper, 3 David Wilson, 2 Ross Batty, 1 David Flatman.
Replacements: 16 Kane Palma Newport, 17 Charlie Beech, 18 Anthony Perenise, 19 David Attwood, 20 Will Spencer, 21 Mark McMillan, 22 Stephen Donald, 23 Sam Vesty.

Referee: Christophe Berdos (France)