U.S. stock futures erased earlier weakness to turn mixed Monday, as a number of multi-billion mergers and a decline in crude futures helped offset the negative sentiment caused by Delta Air Lines imminent bankruptcy. In addition, an upgrade of Dow industrials component Citigroup may also help soothe lingering investor concerns as the open approaches. S&P 500 futures fell 1 point to 1,247.50, but Nasdaq 100 futures tacked on 0.50 to 1,623.00. Worries that the upcoming German election might result in a laggard pace of reform for Europe's largest economy had unnerved investors earlier in the pre-open. On Friday, Dow industrials rose 82.63 points to 10,678, the Nasdaq Composite rose 9.48 points to 2,175 and the S&P 500 rose 9.81 points to 1,241. Siebel Systems rallied $1.25, or 14%, to $10.38 in Instinet pre-open trading after Oracle said it was buying the business software company for $3.61 billion in cash and stock. The deal values Siebel shares at a $10.66 each, or a 17% premium to Friday's closing price. Oracle's stock dipped 21 cents, or 1.6%, to $13.07. Elsewhere, eBay said it was buying Internet phone-service provider Skype Technologies SA in a deal valued at up to $4.1 billion in stock, cash and debt. EBay shares slipped 73 cents, or 1.9%, to $37.89 in the pre-open. Deal talks had been reported between the two companies last week. The deal is expected to reduce eBay's fourth-quarter earnings per share by 1 to 4 cents and 2006 EPS by 4 to 12 cents. Within financials, Wachovia Corp. said it would buy Westcorp , the 84% owner of WFS Financial , as well as the remaining 16% in WFS Financial for a total of $3.91 billion in stock. Wachovia said the deal will lift earnings in its second year. On the downside, Delta shares shed 21 cents, or 19%, to 89 cents in Instinet. The Wall Street Journal and the Washington Post reported that the air carrier may file for bankruptcy protection this week. The Journal report said the deal being worked out would keep it flying, but force the airline to sell off some $3 billion in assets, possibly including its routes to London and Tokyo. Outside of equities, the euro fell sharply against the U.S. dollar and the Japanese yen on concerns that German Chancellor Gerhard Schroeder's party may win enough of the vote to force a "Grand Coalition" between the SPD and Angela Merkel's Christian Democratic Union. The euro was down 0.7% vs. the dollar at $1.2316 and lost 0.6% to 135.29 against the yen. See . The German DAX 30 initially fell, but recovered to unchanged territory following news of Oracle's purchase of Siebel. Markets were more sanguine on the Japanese economy, pushing the Nikkei 225 to a four-year high and more than 200 points higher after Prime Minister Junichiro Koizumi's party scored a landslide victory. The dollar edged up 0.2% vs. the yen to 109.83.