Morgan, ranked fourth, survived a first set tie-break to defeat Brazilian Thiago Moura Monteiro 7-6 (7-3) 6-4.
Meanwhile, Inter have also completed the signing of Genoa midfielder Thiago Motta on a four-year contract.
But Emin Sulimani reduced the deficit on 73 and Thiago Schumacher equalized with a header from his cross with three minutes left.
Thiago Silva added a fourth in the 58th minute to keep the reigning champions ahead of second-placed Juventus who dropped points at home to Chievo .
Kraft made two stops, first to deny substitute Houssine Kharja and then to parry Thiago Motta's point-blank header, before Eto'o's goalbound effort was deflected just wide.
Protecting a first-leg 3-1 lead, Inter were forced to play more than an hour a man short after Thiago Motta saw red for a hand-off on Sergio Busquets.
Rafael Zulli and Thiago Schlieper, secondary school students from Brazil.
In Spain , league leader Barcelona cruised to a 3-0 win at Real Zaragoza with two goals from Cristian Tello and a strike from Thiago Alcantara doing the damage.
The form of Paris Saint-Germain defender Thiago Silva and the return to the side of Real Madrid's Kaka had looked to have given Brazil a new found lease of life.
To cap a dismal evening for Ivorian international Drogba, he was sent off five minutes from the end for a stamping incident on Thiago Motta in the Inter penalty area.
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In the summer the Rossoneri had slashed their wage bill by 35%, letting go a number of veterans and selling their best attacker (Zlatan Ibrahimovic) and their best defender (Thiago Silva).
Thiago Motta equalised, poking Lucio's header past Manuel Neuer.
But the move fell through and PSG moved on to other targets, landing striker Zlatan Ibrahimovic and AC Milan teammate Thiago Silva as well as Napoli winger Ezequiel Lavezzi and Brazilian prodigy Lucas.
Young midfielder Thiago Alcantara made it 3-0 with 10 minutes to go after cutting in from the right, playing a simple one-two with Messi and driving a low left-foot shot into the net.
Last summer Milan owner Silvio Berlusconi decided that the team could no longer operate beyond its means and sold off the crown jewels in the shape of Thiago Silva and Zlatan Ibrahimovic to PSG.
Facing a two-goal deficit, Italy gambled on a more offensive approach after halftime, throwing on Antonio Di Natale, who had scored in the first meeting between the teams three weeks earlier, and later Thiago Motta.
Siena battled on gamely, and on 26 minutes Massimo Maccarone escaped three defenders on the edge of the Milan box to bundle through before firing over on the stretch as Thiago Silva came across to put him under pressure.
Thiago Silva almost made it 2-0 three minutes from the end when he headed against the crossbar from point-blank range, and Borriello killed off any doubt with a spectacular volley from Ronaldinho's cross three minutes into time added on.
With the ball won just inside the Chelsea half, firstly Thiago Motta and then Samuel Eto'o fed the ball through for Milito who, with space afforded by Wesley Sneijder's presence, stepped inside John Terry and beat Petr Cech at the near post.
Eleven minutes from time, Ibrahimovic -- who signed a five-year deal with Barcelona in 2009 but whose spell at the Nou Camp was so unhappy he left after just twelve months -- converted from close range, despite being in an offside position, as he reacted quickest to a towering header against the post by the outstanding Thiago Silva.
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